56073991 has 2 divisors, whose sum is σ = 56073992. Its totient is φ = 56073990.

The previous prime is 56073943. The next prime is 56074033. The reversal of 56073991 is 19937065.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56073991 - 2⁷ = 56073863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56073911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28036995 + 28036996.

It is an arithmetic number, because the mean of its divisors is an integer number (28036996).

Almost surely, 2^56073991 is an apocalyptic number.

56073991 is a deficient number, since it is larger than the sum of its proper divisors (1).

56073991 is an equidigital number, since it uses as much as digits as its factorization.

56073991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 56073991 is about 7488.2568732650. The cubic root of 56073991 is about 382.7546620302.

The spelling of 56073991 in words is "fifty-six million, seventy-three thousand, nine hundred ninety-one".