811797869 has 2 divisors, whose sum is σ = 811797870. Its totient is φ = 811797868.

The previous prime is 811797799. The next prime is 811797911. The reversal of 811797869 is 968797118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 614395369 + 197402500 = 24787^2 + 14050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-811797869 is a prime.

It is a super-2 number, since 2×811797869² = 1318031560225882322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811797169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405898934 + 405898935.

It is an arithmetic number, because the mean of its divisors is an integer number (405898935).

Almost surely, 2^811797869 is an apocalyptic number.

It is an amenable number.

811797869 is a deficient number, since it is larger than the sum of its proper divisors (1).

811797869 is an equidigital number, since it uses as much as digits as its factorization.

811797869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 56.

The square root of 811797869 is about 28492.0667730511. The cubic root of 811797869 is about 932.8589207880.

The spelling of 811797869 in words is "eight hundred eleven million, seven hundred ninety-seven thousand, eight hundred sixty-nine".