55899931 has 2 divisors, whose sum is σ = 55899932. Its totient is φ = 55899930.

The previous prime is 55899929. The next prime is 55899937. The reversal of 55899931 is 13999855.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55899931 - 2¹ = 55899929 is a prime.

It is a super-2 number, since 2×55899931² = 6249604571609522, which contains 22 as substring.

Together with 55899929, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55899937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27949965 + 27949966.

It is an arithmetic number, because the mean of its divisors is an integer number (27949966).

Almost surely, 2^55899931 is an apocalyptic number.

55899931 is a deficient number, since it is larger than the sum of its proper divisors (1).

55899931 is an equidigital number, since it uses as much as digits as its factorization.

55899931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 437400, while the sum is 49.

The square root of 55899931 is about 7476.6256426278. The cubic root of 55899931 is about 382.3582136426.

It can be divided in two parts, 558 and 99931, that added together give a square (100489 = 317²).

The spelling of 55899931 in words is "fifty-five million, eight hundred ninety-nine thousand, nine hundred thirty-one".