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55442645 = 511088529
BaseRepresentation
bin1101001101111…
…1110011010101
310212022210000022
43103133303111
5103143131040
65300154525
71242153236
oct323376325
9125283008
1055442645
1129328975
1216698a45
13b6427cb
14751308d
154d026b5
hex34dfcd5

55442645 has 4 divisors (see below), whose sum is σ = 66531180. Its totient is φ = 44354112.

The previous prime is 55442641. The next prime is 55442669. The reversal of 55442645 is 54624455.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54624455 = 510924891.

It can be written as a sum of positive squares in 2 ways, for example, as 42432196 + 13010449 = 6514^2 + 3607^2 .

It is a cyclic number.

It is not a de Polignac number, because 55442645 - 22 = 55442641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55442641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5544260 + ... + 5544269.

It is an arithmetic number, because the mean of its divisors is an integer number (16632795).

Almost surely, 255442645 is an apocalyptic number.

It is an amenable number.

55442645 is a deficient number, since it is larger than the sum of its proper divisors (11088535).

55442645 is a wasteful number, since it uses less digits than its factorization.

55442645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11088534.

The product of its digits is 96000, while the sum is 35.

The square root of 55442645 is about 7445.9818022877. The cubic root of 55442645 is about 381.3127382196.

The spelling of 55442645 in words is "fifty-five million, four hundred forty-two thousand, six hundred forty-five".

Divisors: 1 5 11088529 55442645