55406931 has 12 divisors (see below), whose sum is σ = 77229768. Its totient is φ = 35330944.

The previous prime is 55406917. The next prime is 55406933. The reversal of 55406931 is 13960455.

It is a happy number.

It is not a de Polignac number, because 55406931 - 2²¹ = 53309779 is a prime.

It is a super-2 number, since 2×55406931² = 6139856005677522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 55406892 and 55406901.

It is not an unprimeable number, because it can be changed into a prime (55406933) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15870 + ... + 19043.

It is an arithmetic number, because the mean of its divisors is an integer number (6435814).

Almost surely, 2^55406931 is an apocalyptic number.

55406931 is a deficient number, since it is larger than the sum of its proper divisors (21822837).

55406931 is a wasteful number, since it uses less digits than its factorization.

55406931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34962 (or 34939 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 55406931 is about 7443.5832097183. The cubic root of 55406931 is about 381.2308450109.

The spelling of 55406931 in words is "fifty-five million, four hundred six thousand, nine hundred thirty-one".