811247863 has 4 divisors (see below), whose sum is σ = 812602800. Its totient is φ = 809892928.

The previous prime is 811247851. The next prime is 811247873. The reversal of 811247863 is 368742118.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-811247863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811247873) 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, 676570 + ... + 677767.

It is an arithmetic number, because the mean of its divisors is an integer number (203150700).

Almost surely, 2^811247863 is an apocalyptic number.

811247863 is a deficient number, since it is larger than the sum of its proper divisors (1354937).

811247863 is a wasteful number, since it uses less digits than its factorization.

811247863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354936.

The product of its digits is 64512, while the sum is 40.

The square root of 811247863 is about 28482.4132228995. The cubic root of 811247863 is about 932.6481975937.

The spelling of 811247863 in words is "eight hundred eleven million, two hundred forty-seven thousand, eight hundred sixty-three".