811268641 has 4 divisors (see below), whose sum is σ = 811379632. Its totient is φ = 811157652.

The previous prime is 811268621. The next prime is 811268651. The reversal of 811268641 is 146862118.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 811268641 - 2⁵ = 811268609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 811268641.

It is not an unprimeable number, because it can be changed into a prime (811268621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43695 + ... + 59428.

It is an arithmetic number, because the mean of its divisors is an integer number (202844908).

Almost surely, 2^811268641 is an apocalyptic number.

It is an amenable number.

811268641 is a deficient number, since it is larger than the sum of its proper divisors (110991).

811268641 is a wasteful number, since it uses less digits than its factorization.

811268641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110990.

The product of its digits is 18432, while the sum is 37.

The square root of 811268641 is about 28482.7779719605. Note that the first 3 decimals coincide. The cubic root of 811268641 is about 932.6561599768.

The spelling of 811268641 in words is "eight hundred eleven million, two hundred sixty-eight thousand, six hundred forty-one".