55402131 has 4 divisors (see below), whose sum is σ = 73869512. Its totient is φ = 36934752.

The previous prime is 55402129. The next prime is 55402153. The reversal of 55402131 is 13120455.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 55402131 - 2¹ = 55402129 is a prime.

It is a super-2 number, since 2×55402131² = 6138792238682322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55402098 and 55402107.

It is not an unprimeable number, because it can be changed into a prime (55402231) 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, 9233686 + ... + 9233691.

It is an arithmetic number, because the mean of its divisors is an integer number (18467378).

Almost surely, 2^55402131 is an apocalyptic number.

55402131 is a deficient number, since it is larger than the sum of its proper divisors (18467381).

55402131 is a wasteful number, since it uses less digits than its factorization.

55402131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18467380.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 55402131 is about 7443.2607773744. The cubic root of 55402131 is about 381.2198357932.

Adding to 55402131 its reverse (13120455), we get a palindrome (68522586).

The spelling of 55402131 in words is "fifty-five million, four hundred two thousand, one hundred thirty-one".