811963761 has 12 divisors (see below), whose sum is σ = 1259372592. Its totient is φ = 463979208.

The previous prime is 811963753. The next prime is 811963777. The reversal of 811963761 is 167369118.

It is not a de Polignac number, because 811963761 - 2³ = 811963753 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (811963751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2761635 + ... + 2761928.

It is an arithmetic number, because the mean of its divisors is an integer number (104947716).

Almost surely, 2^811963761 is an apocalyptic number.

It is an amenable number.

811963761 is a deficient number, since it is larger than the sum of its proper divisors (447408831).

811963761 is a wasteful number, since it uses less digits than its factorization.

811963761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5523580 (or 5523573 counting only the distinct ones).

The product of its digits is 54432, while the sum is 42.

The square root of 811963761 is about 28494.9778206617. The cubic root of 811963761 is about 932.9224601236.

The spelling of 811963761 in words is "eight hundred eleven million, nine hundred sixty-three thousand, seven hundred sixty-one".