55963891 has 2 divisors, whose sum is σ = 55963892. Its totient is φ = 55963890.

The previous prime is 55963883. The next prime is 55963903. The reversal of 55963891 is 19836955.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55963891 - 2³ = 55963883 is a prime.

It is not a weakly prime, because it can be changed into another prime (55963841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27981945 + 27981946.

It is an arithmetic number, because the mean of its divisors is an integer number (27981946).

Almost surely, 2^55963891 is an apocalyptic number.

55963891 is a deficient number, since it is larger than the sum of its proper divisors (1).

55963891 is an equidigital number, since it uses as much as digits as its factorization.

55963891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 46.

The square root of 55963891 is about 7480.9017504576. The cubic root of 55963891 is about 382.5039878833.

The spelling of 55963891 in words is "fifty-five million, nine hundred sixty-three thousand, eight hundred ninety-one".