55978531 has 12 divisors (see below), whose sum is σ = 65946720. Its totient is φ = 47370960.

The previous prime is 55978519. The next prime is 55978537. The reversal of 55978531 is 13587955.

It is not a de Polignac number, because 55978531 - 2²³ = 47589923 is a prime.

It is a super-2 number, since 2×55978531² = 6267191865835922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55978537) 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, 3360 + ... + 11101.

It is an arithmetic number, because the mean of its divisors is an integer number (5495560).

Almost surely, 2^55978531 is an apocalyptic number.

55978531 is a deficient number, since it is larger than the sum of its proper divisors (9968189).

55978531 is a wasteful number, since it uses less digits than its factorization.

55978531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14554 (or 14547 counting only the distinct ones).

The product of its digits is 189000, while the sum is 43.

The square root of 55978531 is about 7481.8801781370. The cubic root of 55978531 is about 382.5373389724.

The spelling of 55978531 in words is "fifty-five million, nine hundred seventy-eight thousand, five hundred thirty-one".