55135431 has 16 divisors (see below), whose sum is σ = 87965920. Its totient is φ = 33929280.

The previous prime is 55135427. The next prime is 55135433. The reversal of 55135431 is 13453155.

55135431 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 55135431 - 2² = 55135427 is a prime.

It is a super-2 number, since 2×55135431² = 6079831503111522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55135395 and 55135404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55135433) 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, 78190 + ... + 78891.

It is an arithmetic number, because the mean of its divisors is an integer number (5497870).

Almost surely, 2^55135431 is an apocalyptic number.

55135431 is a deficient number, since it is larger than the sum of its proper divisors (32830489).

55135431 is a wasteful number, since it uses less digits than its factorization.

55135431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157103 (or 157097 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 55135431 is about 7425.3236293107. The cubic root of 55135431 is about 380.6071342533.

Adding to 55135431 its reverse (13453155), we get a palindrome (68588586).

The spelling of 55135431 in words is "fifty-five million, one hundred thirty-five thousand, four hundred thirty-one".