515096991 has 12 divisors (see below), whose sum is σ = 787795632. Its totient is φ = 323198016.

The previous prime is 515096987. The next prime is 515096999. The reversal of 515096991 is 199690515.

It is a happy number.

515096991 is a `hidden beast` number, since 51 + 509 + 6 + 9 + 91 = 666.

It is not a de Polignac number, because 515096991 - 2² = 515096987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515096999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1683171 + ... + 1683476.

It is an arithmetic number, because the mean of its divisors is an integer number (65649636).

Almost surely, 2^515096991 is an apocalyptic number.

515096991 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

515096991 is a deficient number, since it is larger than the sum of its proper divisors (272698641).

515096991 is a wasteful number, since it uses less digits than its factorization.

515096991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3366670 (or 3366667 counting only the distinct ones).

The product of its (nonzero) digits is 109350, while the sum is 45.

The square root of 515096991 is about 22695.7483022702. The cubic root of 515096991 is about 801.6097747547.

The spelling of 515096991 in words is "five hundred fifteen million, ninety-six thousand, nine hundred ninety-one".