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557621845 = 51121754217
BaseRepresentation
bin100001001111001…
…010001001010101
31102212021010100221
4201033022021111
52120222344340
6131155434341
716550464444
oct4117121125
91385233327
10557621845
11266843600
121368b59b1
138b6ab771
14540b4d5b
1533e4b44a
hex213ca255

557621845 has 24 divisors (see below), whose sum is σ = 778787352. Its totient is φ = 381680640.

The previous prime is 557621843. The next prime is 557621849. The reversal of 557621845 is 548126755.

It can be written as a sum of positive squares in 4 ways, for example, as 31102929 + 526518916 = 5577^2 + 22946^2 .

It is not a de Polignac number, because 557621845 - 21 = 557621843 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (557621843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16824 + ... + 37393.

It is an arithmetic number, because the mean of its divisors is an integer number (32449473).

Almost surely, 2557621845 is an apocalyptic number.

557621845 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

557621845 is a deficient number, since it is larger than the sum of its proper divisors (221165507).

557621845 is a wasteful number, since it uses less digits than its factorization.

557621845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54261 (or 54250 counting only the distinct ones).

The product of its digits is 336000, while the sum is 43.

The square root of 557621845 is about 23614.0179766172. The cubic root of 557621845 is about 823.0886120888.

The spelling of 557621845 in words is "five hundred fifty-seven million, six hundred twenty-one thousand, eight hundred forty-five".

Divisors: 1 5 11 17 55 85 121 187 605 935 2057 10285 54217 271085 596387 921689 2981935 4608445 6560257 10138579 32801285 50692895 111524369 557621845