811551630 has 16 divisors (see below), whose sum is σ = 1947723984. Its totient is φ = 216413760.

The previous prime is 811551623. The next prime is 811551647. The reversal of 811551630 is 36155118.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 27051721 = 811551630 / (8 + 1 + 1 + 5 + 5 + 1 + 6 + 3 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13525831 + ... + 13525890.

It is an arithmetic number, because the mean of its divisors is an integer number (121732749).

Almost surely, 2^811551630 is an apocalyptic number.

811551630 is an abundant number, since it is smaller than the sum of its proper divisors (1136172354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

811551630 is a wasteful number, since it uses less digits than its factorization.

811551630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27051731.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 811551630 is about 28487.7452600237. The cubic root of 811551630 is about 932.7645912815.

The spelling of 811551630 in words is "eight hundred eleven million, five hundred fifty-one thousand, six hundred thirty".