813487971 has 4 divisors (see below), whose sum is σ = 1084650632. Its totient is φ = 542325312.

The previous prime is 813487963. The next prime is 813487991. The reversal of 813487971 is 179784318.

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

It is not a de Polignac number, because 813487971 - 2³ = 813487963 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 813487971.

It is not an unprimeable number, because it can be changed into a prime (813487901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135581326 + ... + 135581331.

It is an arithmetic number, because the mean of its divisors is an integer number (271162658).

Almost surely, 2^813487971 is an apocalyptic number.

813487971 is a deficient number, since it is larger than the sum of its proper divisors (271162661).

813487971 is a wasteful number, since it uses less digits than its factorization.

813487971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271162660.

The product of its digits is 338688, while the sum is 48.

The square root of 813487971 is about 28521.7105202335. The cubic root of 813487971 is about 933.5058527038.

The spelling of 813487971 in words is "eight hundred thirteen million, four hundred eighty-seven thousand, nine hundred seventy-one".