56391007 has 2 divisors, whose sum is σ = 56391008. Its totient is φ = 56391006.

The previous prime is 56391001. The next prime is 56391011. The reversal of 56391007 is 70019365.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56391007 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56391007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56391001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28195503 + 28195504.

It is an arithmetic number, because the mean of its divisors is an integer number (28195504).

Almost surely, 2^56391007 is an apocalyptic number.

56391007 is a deficient number, since it is larger than the sum of its proper divisors (1).

56391007 is an equidigital number, since it uses as much as digits as its factorization.

56391007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 56391007 is about 7509.3945827876. The cubic root of 56391007 is about 383.4746119871.

The spelling of 56391007 in words is "fifty-six million, three hundred ninety-one thousand, seven".