56817349091 has 2 divisors, whose sum is σ = 56817349092. Its totient is φ = 56817349090.

The previous prime is 56817349021. The next prime is 56817349093. The reversal of 56817349091 is 19094371865.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56817349091 - 2¹⁰ = 56817348067 is a prime.

It is a super-2 number, since 2×56817349091² (a number of 22 digits) contains 22 as substring.

Together with 56817349093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56817349093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28408674545 + 28408674546.

It is an arithmetic number, because the mean of its divisors is an integer number (28408674546).

Almost surely, 2^56817349091 is an apocalyptic number.

56817349091 is a deficient number, since it is larger than the sum of its proper divisors (1).

56817349091 is an equidigital number, since it uses as much as digits as its factorization.

56817349091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 56817349091 in words is "fifty-six billion, eight hundred seventeen million, three hundred forty-nine thousand, ninety-one".