811079993 has 2 divisors, whose sum is σ = 811079994. Its totient is φ = 811079992.

The previous prime is 811079977. The next prime is 811080059. The reversal of 811079993 is 399970118.

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., 666310969 + 144769024 = 25813^2 + 12032^2 .

It is a cyclic number.

It is not a de Polignac number, because 811079993 - 2⁴ = 811079977 is a prime.

It is not a weakly prime, because it can be changed into another prime (811079293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405539996 + 405539997.

It is an arithmetic number, because the mean of its divisors is an integer number (405539997).

Almost surely, 2^811079993 is an apocalyptic number.

It is an amenable number.

811079993 is a deficient number, since it is larger than the sum of its proper divisors (1).

811079993 is an equidigital number, since it uses as much as digits as its factorization.

811079993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 811079993 is about 28479.4661642384. The cubic root of 811079993 is about 932.5838627747.

The spelling of 811079993 in words is "eight hundred eleven million, seventy-nine thousand, nine hundred ninety-three".