56719391 has 2 divisors, whose sum is σ = 56719392. Its totient is φ = 56719390.

The previous prime is 56719387. The next prime is 56719417. The reversal of 56719391 is 19391765.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56719391 - 2² = 56719387 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 (56719301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28359695 + 28359696.

It is an arithmetic number, because the mean of its divisors is an integer number (28359696).

Almost surely, 2^56719391 is an apocalyptic number.

56719391 is a deficient number, since it is larger than the sum of its proper divisors (1).

56719391 is an equidigital number, since it uses as much as digits as its factorization.

56719391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51030, while the sum is 41.

The square root of 56719391 is about 7531.2277219588. The cubic root of 56719391 is about 384.2175394087.

The spelling of 56719391 in words is "fifty-six million, seven hundred nineteen thousand, three hundred ninety-one".