55135531 has 16 divisors (see below), whose sum is σ = 63037440. Its totient is φ = 47734720.

The previous prime is 55135517. The next prime is 55135541. The reversal of 55135531 is 13553155.

55135531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55135531 - 2⁵ = 55135499 is a prime.

It is a super-2 number, since 2×55135531² = 6079853557303922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55135531.

It is not an unprimeable number, because it can be changed into a prime (55135541) 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 15 ways as a sum of consecutive naturals, for example, 96615 + ... + 97183.

It is an arithmetic number, because the mean of its divisors is an integer number (3939840).

Almost surely, 2^55135531 is an apocalyptic number.

55135531 is a deficient number, since it is larger than the sum of its proper divisors (7901909).

55135531 is a wasteful number, since it uses less digits than its factorization.

55135531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986.

The product of its digits is 5625, while the sum is 28.

The square root of 55135531 is about 7425.3303630209. The cubic root of 55135531 is about 380.6073643575.

Adding to 55135531 its reverse (13553155), we get a palindrome (68688686).

The spelling of 55135531 in words is "fifty-five million, one hundred thirty-five thousand, five hundred thirty-one".