55072431 has 24 divisors (see below), whose sum is σ = 84040320. Its totient is φ = 34656336.

The previous prime is 55072427. The next prime is 55072453. The reversal of 55072431 is 13427055.

It is a happy number.

55072431 is a `hidden beast` number, since 550 + 72 + 43 + 1 = 666.

It is not a de Polignac number, because 55072431 - 2² = 55072427 is a prime.

It is a super-2 number, since 2×55072431² = 6065945312499522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55072395 and 55072404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55074431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75390 + ... + 76116.

It is an arithmetic number, because the mean of its divisors is an integer number (3501680).

Almost surely, 2^55072431 is an apocalyptic number.

55072431 is a deficient number, since it is larger than the sum of its proper divisors (28967889).

55072431 is a wasteful number, since it uses less digits than its factorization.

55072431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195 (or 1192 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 55072431 is about 7421.0801774405. The cubic root of 55072431 is about 380.4621132407.

Adding to 55072431 its reverse (13427055), we get a palindrome (68499486).

The spelling of 55072431 in words is "fifty-five million, seventy-two thousand, four hundred thirty-one".