811601987 has 8 divisors (see below), whose sum is σ = 928079616. Its totient is φ = 695257992.

The previous prime is 811601983. The next prime is 811602017. The reversal of 811601987 is 789106118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 811601987 - 2² = 811601983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811601983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20033 + ... + 44994.

It is an arithmetic number, because the mean of its divisors is an integer number (116009952).

Almost surely, 2^811601987 is an apocalyptic number.

811601987 is a deficient number, since it is larger than the sum of its proper divisors (116477629).

811601987 is a wasteful number, since it uses less digits than its factorization.

811601987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66817.

The product of its (nonzero) digits is 24192, while the sum is 41.

The square root of 811601987 is about 28488.6290824954. The cubic root of 811601987 is about 932.7838836482.

The spelling of 811601987 in words is "eight hundred eleven million, six hundred one thousand, nine hundred eighty-seven".