515868994 has 16 divisors (see below), whose sum is σ = 801211320. Its totient is φ = 248814720.

The previous prime is 515868971. The next prime is 515869007. The reversal of 515868994 is 499868515.

It can be written as a sum of positive squares in 4 ways, for example, as 488984769 + 26884225 = 22113^2 + 5185^2 .

It is a super-2 number, since 2×515868994² = 532241637941144072, which contains 22 as substring.

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, 73252 + ... + 79984.

Almost surely, 2^515868994 is an apocalyptic number.

515868994 is a deficient number, since it is larger than the sum of its proper divisors (285342326).

515868994 is a wasteful number, since it uses less digits than its factorization.

515868994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8085.

The product of its digits is 3110400, while the sum is 55.

The square root of 515868994 is about 22712.7495913639. The cubic root of 515868994 is about 802.0100464535.

The spelling of 515868994 in words is "five hundred fifteen million, eight hundred sixty-eight thousand, nine hundred ninety-four".