56656987 has 2 divisors, whose sum is σ = 56656988. Its totient is φ = 56656986.

The previous prime is 56656973. The next prime is 56656997. The reversal of 56656987 is 78965665.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56656987 is a prime.

It is not a weakly prime, because it can be changed into another prime (56656927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28328493 + 28328494.

It is an arithmetic number, because the mean of its divisors is an integer number (28328494).

Almost surely, 2^56656987 is an apocalyptic number.

56656987 is a deficient number, since it is larger than the sum of its proper divisors (1).

56656987 is an equidigital number, since it uses as much as digits as its factorization.

56656987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2721600, while the sum is 52.

The square root of 56656987 is about 7527.0835653658. The cubic root of 56656987 is about 384.0765793271.

The spelling of 56656987 in words is "fifty-six million, six hundred fifty-six thousand, nine hundred eighty-seven".