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55538631 = 3247131297
BaseRepresentation
bin1101001111011…
…1001111000111
310212111122200100
43103313033013
5103204214011
65302215143
71243033131
oct323671707
9125448610
1055538631
1129393aa5
12167244b3
13b6773c5
14753a051
154d20d56
hex34f73c7

55538631 has 12 divisors (see below), whose sum is σ = 81929952. Its totient is φ = 36237696.

The previous prime is 55538627. The next prime is 55538633. The reversal of 55538631 is 13683555.

It is not a de Polignac number, because 55538631 - 22 = 55538627 is a prime.

It is a super-3 number, since 3×555386313 (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55538633) 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 11 ways as a sum of consecutive naturals, for example, 65226 + ... + 66071.

It is an arithmetic number, because the mean of its divisors is an integer number (6827496).

Almost surely, 255538631 is an apocalyptic number.

55538631 is a deficient number, since it is larger than the sum of its proper divisors (26391321).

55538631 is a wasteful number, since it uses less digits than its factorization.

55538631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131350 (or 131347 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 55538631 is about 7452.4245048172. The cubic root of 55538631 is about 381.5326626895.

It can be divided in two parts, 55538 and 631, that added together give a square (56169 = 2372).

The spelling of 55538631 in words is "fifty-five million, five hundred thirty-eight thousand, six hundred thirty-one".

Divisors: 1 3 9 47 141 423 131297 393891 1181673 6170959 18512877 55538631