56947391 has 2 divisors, whose sum is σ = 56947392. Its totient is φ = 56947390.

The previous prime is 56947369. The next prime is 56947393. The reversal of 56947391 is 19374965.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56947391 - 2²² = 52753087 is a prime.

Together with 56947393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56947393) 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, 28473695 + 28473696.

It is an arithmetic number, because the mean of its divisors is an integer number (28473696).

Almost surely, 2^56947391 is an apocalyptic number.

56947391 is a deficient number, since it is larger than the sum of its proper divisors (1).

56947391 is an equidigital number, since it uses as much as digits as its factorization.

56947391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 44.

The square root of 56947391 is about 7546.3495148317. The cubic root of 56947391 is about 384.7316756320.

The spelling of 56947391 in words is "fifty-six million, nine hundred forty-seven thousand, three hundred ninety-one".