55540331 has 24 divisors (see below), whose sum is σ = 72828672. Its totient is φ = 41382000.

The previous prime is 55540327. The next prime is 55540349. The reversal of 55540331 is 13304555.

It is not a de Polignac number, because 55540331 - 2² = 55540327 is a prime.

It is a super-2 number, since 2×55540331² = 6169456735179122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55540331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55540301) 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 23 ways as a sum of consecutive naturals, for example, 18056 + ... + 20906.

It is an arithmetic number, because the mean of its divisors is an integer number (3034528).

Almost surely, 2^55540331 is an apocalyptic number.

55540331 is a deficient number, since it is larger than the sum of its proper divisors (17288341).

55540331 is a wasteful number, since it uses less digits than its factorization.

55540331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2903 (or 2892 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 55540331 is about 7452.5385607858. The cubic root of 55540331 is about 381.5365554688.

Adding to 55540331 its reverse (13304555), we get a palindrome (68844886).

The spelling of 55540331 in words is "fifty-five million, five hundred forty thousand, three hundred thirty-one".