515721164 has 72 divisors (see below), whose sum is σ = 1077404160. Its totient is φ = 211528512.

The previous prime is 515721149. The next prime is 515721221. The reversal of 515721164 is 461127515.

It is a self number, because there is not a number n which added to its sum of digits gives 515721164.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6213467 + ... + 6213549.

Almost surely, 2^515721164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 515721164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (538702080).

515721164 is an abundant number, since it is smaller than the sum of its proper divisors (561682996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

515721164 is a wasteful number, since it uses less digits than its factorization.

515721164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 224 counting only the distinct ones).

The product of its digits is 8400, while the sum is 32.

The square root of 515721164 is about 22709.4950186040. The cubic root of 515721164 is about 801.9334297972.

Adding to 515721164 its reverse (461127515), we get a palindrome (976848679).

The spelling of 515721164 in words is "five hundred fifteen million, seven hundred twenty-one thousand, one hundred sixty-four".