56971643 has 2 divisors, whose sum is σ = 56971644. Its totient is φ = 56971642.

The previous prime is 56971637. The next prime is 56971657. The reversal of 56971643 is 34617965.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56971643 - 2¹⁴ = 56955259 is a prime.

It is a super-2 number, since 2×56971643² = 6491536212238898, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56971643.

It is not a weakly prime, because it can be changed into another prime (56971613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28485821 + 28485822.

It is an arithmetic number, because the mean of its divisors is an integer number (28485822).

Almost surely, 2^56971643 is an apocalyptic number.

56971643 is a deficient number, since it is larger than the sum of its proper divisors (1).

56971643 is an equidigital number, since it uses as much as digits as its factorization.

56971643 is an odious number, because the sum of its binary digits is odd.

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

The square root of 56971643 is about 7547.9562134395. The cubic root of 56971643 is about 384.7862826897.

The spelling of 56971643 in words is "fifty-six million, nine hundred seventy-one thousand, six hundred forty-three".