56991007 has 2 divisors, whose sum is σ = 56991008. Its totient is φ = 56991006.

The previous prime is 56990993. The next prime is 56991031. The reversal of 56991007 is 70019965.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56991007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56991047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28495503 + 28495504.

It is an arithmetic number, because the mean of its divisors is an integer number (28495504).

Almost surely, 2^56991007 is an apocalyptic number.

56991007 is a deficient number, since it is larger than the sum of its proper divisors (1).

56991007 is an equidigital number, since it uses as much as digits as its factorization.

56991007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 56991007 is about 7549.2388358032. The cubic root of 56991007 is about 384.8298725482.

The spelling of 56991007 in words is "fifty-six million, nine hundred ninety-one thousand, seven".