515881972 has 18 divisors (see below), whose sum is σ = 927690162. Its totient is φ = 250835184.

The previous prime is 515881969. The next prime is 515881979. The reversal of 515881972 is 279188515.

It can be written as a sum of positive squares in only one way, i.e., 501939216 + 13942756 = 22404^2 + 3734^2 .

It is a super-2 number, since 2×515881972² = 532268418069217568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515881979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 275383 + ... + 277249.

Almost surely, 2^515881972 is an apocalyptic number.

It is an amenable number.

515881972 is a deficient number, since it is larger than the sum of its proper divisors (411808190).

515881972 is an equidigital number, since it uses as much as digits as its factorization.

515881972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3775 (or 1906 counting only the distinct ones).

The product of its digits is 201600, while the sum is 46.

The square root of 515881972 is about 22713.0352881336. The cubic root of 515881972 is about 802.0167719330.

The spelling of 515881972 in words is "five hundred fifteen million, eight hundred eighty-one thousand, nine hundred seventy-two".