55431131 has 8 divisors (see below), whose sum is σ = 65393664. Its totient is φ = 45979560.

The previous prime is 55431121. The next prime is 55431137. The reversal of 55431131 is 13113455.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55431131 is a prime.

It is a super-2 number, since 2×55431131² = 6145220567878322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55431097 and 55431106.

It is not an unprimeable number, because it can be changed into a prime (55431137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127505 + ... + 127938.

It is an arithmetic number, because the mean of its divisors is an integer number (8174208).

Almost surely, 2^55431131 is an apocalyptic number.

55431131 is a deficient number, since it is larger than the sum of its proper divisors (9962533).

55431131 is a wasteful number, since it uses less digits than its factorization.

55431131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255481.

The product of its digits is 900, while the sum is 23.

The square root of 55431131 is about 7445.2085934512. The cubic root of 55431131 is about 381.2863401354.

Adding to 55431131 its reverse (13113455), we get a palindrome (68544586).

The spelling of 55431131 in words is "fifty-five million, four hundred thirty-one thousand, one hundred thirty-one".