55135031531 has 4 divisors (see below), whose sum is σ = 55135537200. Its totient is φ = 55134525864.

The previous prime is 55135031527. The next prime is 55135031563. The reversal of 55135031531 is 13513053155.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 55135031531 - 2² = 55135031527 is a prime.

It is a super-2 number, since 2×55135031531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55135031521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14216 + ... + 332373.

It is an arithmetic number, because the mean of its divisors is an integer number (13783884300).

Almost surely, 2^55135031531 is an apocalyptic number.

55135031531 is a deficient number, since it is larger than the sum of its proper divisors (505669).

55135031531 is a wasteful number, since it uses less digits than its factorization.

55135031531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505668.

The product of its (nonzero) digits is 16875, while the sum is 32.

Adding to 55135031531 its reverse (13513053155), we get a palindrome (68648084686).

The spelling of 55135031531 in words is "fifty-five billion, one hundred thirty-five million, thirty-one thousand, five hundred thirty-one".