55402431 has 32 divisors (see below), whose sum is σ = 87610368. Its totient is φ = 30481920.

The previous prime is 55402429. The next prime is 55402453. The reversal of 55402431 is 13420455.

It is not a de Polignac number, because 55402431 - 2¹ = 55402429 is a prime.

It is a super-2 number, since 2×55402431² = 6138858721419522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55402231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87486 + ... + 88116.

It is an arithmetic number, because the mean of its divisors is an integer number (2737824).

Almost surely, 2^55402431 is an apocalyptic number.

55402431 is a deficient number, since it is larger than the sum of its proper divisors (32207937).

55402431 is a wasteful number, since it uses less digits than its factorization.

55402431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 55402431 is about 7443.2809298051. The cubic root of 55402431 is about 381.2205238879.

Adding to 55402431 its reverse (13420455), we get a palindrome (68822886).

The spelling of 55402431 in words is "fifty-five million, four hundred two thousand, four hundred thirty-one".