56647391 has 2 divisors, whose sum is σ = 56647392. Its totient is φ = 56647390.

The previous prime is 56647373. The next prime is 56647397. The reversal of 56647391 is 19374665.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56647391 - 2¹⁸ = 56385247 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56647397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28323695 + 28323696.

It is an arithmetic number, because the mean of its divisors is an integer number (28323696).

Almost surely, 2^56647391 is an apocalyptic number.

56647391 is a deficient number, since it is larger than the sum of its proper divisors (1).

56647391 is an equidigital number, since it uses as much as digits as its factorization.

56647391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 41.

The square root of 56647391 is about 7526.4461068953. The cubic root of 56647391 is about 384.0548944056.

The spelling of 56647391 in words is "fifty-six million, six hundred forty-seven thousand, three hundred ninety-one".