812987148964 has 9 divisors (see below), whose sum is σ = 1422730666497. Its totient is φ = 406492672824.

The previous prime is 812987148929. The next prime is 812987148971. The reversal of 812987148964 is 469841789218.

The square root of 812987148964 is 901658.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 169462308964 + 643524840000 = 411658^2 + 802200^2 .

It is a super-2 number, since 2×812987148964² (a number of 25 digits) contains 22 as substring.

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 812987148964.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1577902 + ... + 2028730.

Almost surely, 2^812987148964 is an apocalyptic number.

812987148964 is the 901658-th square number.

It is an amenable number.

812987148964 is a deficient number, since it is larger than the sum of its proper divisors (609743517533).

812987148964 is an frugal number, since it uses more digits than its factorization.

812987148964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901662 (or 450831 counting only the distinct ones).

The product of its digits is 55738368, while the sum is 67.

The spelling of 812987148964 in words is "eight hundred twelve billion, nine hundred eighty-seven million, one hundred forty-eight thousand, nine hundred sixty-four".