56218993 has 2 divisors, whose sum is σ = 56218994. Its totient is φ = 56218992.

The previous prime is 56218991. The next prime is 56219011. The reversal of 56218993 is 39981265.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45927729 + 10291264 = 6777^2 + 3208^2 .

It is a cyclic number.

It is not a de Polignac number, because 56218993 - 2¹ = 56218991 is a prime.

Together with 56218991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (56218991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28109496 + 28109497.

It is an arithmetic number, because the mean of its divisors is an integer number (28109497).

Almost surely, 2^56218993 is an apocalyptic number.

It is an amenable number.

56218993 is a deficient number, since it is larger than the sum of its proper divisors (1).

56218993 is an equidigital number, since it uses as much as digits as its factorization.

56218993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The square root of 56218993 is about 7497.9325817188. The cubic root of 56218993 is about 383.0843004223.

The spelling of 56218993 in words is "fifty-six million, two hundred eighteen thousand, nine hundred ninety-three".