55402331 has 16 divisors (see below), whose sum is σ = 60217344. Its totient is φ = 50834784.

The previous prime is 55402279. The next prime is 55402349. The reversal of 55402331 is 13320455.

It is not a de Polignac number, because 55402331 - 2¹⁸ = 55140187 is a prime.

It is a super-2 number, since 2×55402331² = 6138836560467122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55402297 and 55402306.

It is not an unprimeable number, because it can be changed into a prime (55402381) 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 15 ways as a sum of consecutive naturals, for example, 56810 + ... + 57776.

It is an arithmetic number, because the mean of its divisors is an integer number (3763584).

Almost surely, 2^55402331 is an apocalyptic number.

55402331 is a deficient number, since it is larger than the sum of its proper divisors (4815013).

55402331 is a wasteful number, since it uses less digits than its factorization.

55402331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 55402331 is about 7443.2742123342. The cubic root of 55402331 is about 381.2202945233.

Adding to 55402331 its reverse (13320455), we get a palindrome (68722786).

The spelling of 55402331 in words is "fifty-five million, four hundred two thousand, three hundred thirty-one".