811997699 has 4 divisors (see below), whose sum is σ = 854734440. Its totient is φ = 769260960.

The previous prime is 811997653. The next prime is 811997713. The reversal of 811997699 is 996799118.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 811997699 - 2²⁴ = 795220483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811997399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21368342 + ... + 21368379.

It is an arithmetic number, because the mean of its divisors is an integer number (213683610).

Almost surely, 2^811997699 is an apocalyptic number.

811997699 is a deficient number, since it is larger than the sum of its proper divisors (42736741).

811997699 is a wasteful number, since it uses less digits than its factorization.

811997699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42736740.

The product of its digits is 2204496, while the sum is 59.

The square root of 811997699 is about 28495.5733228865. The cubic root of 811997699 is about 932.9354578635.

The spelling of 811997699 in words is "eight hundred eleven million, nine hundred ninety-seven thousand, six hundred ninety-nine".