56643973 has 2 divisors, whose sum is σ = 56643974. Its totient is φ = 56643972.

The previous prime is 56643947. The next prime is 56644019. The reversal of 56643973 is 37934665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45131524 + 11512449 = 6718^2 + 3393^2 .

It is a cyclic number.

It is not a de Polignac number, because 56643973 - 2⁵ = 56643941 is a prime.

It is a super-3 number, since 3×56643973³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56643173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28321986 + 28321987.

It is an arithmetic number, because the mean of its divisors is an integer number (28321987).

Almost surely, 2^56643973 is an apocalyptic number.

It is an amenable number.

56643973 is a deficient number, since it is larger than the sum of its proper divisors (1).

56643973 is an equidigital number, since it uses as much as digits as its factorization.

56643973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 43.

The square root of 56643973 is about 7526.2190374716. The cubic root of 56643973 is about 384.0471698602.

It can be divided in two parts, 5664397 and 3, that added together give a square (5664400 = 2380²).

The spelling of 56643973 in words is "fifty-six million, six hundred forty-three thousand, nine hundred seventy-three".