515661121 has 16 divisors (see below), whose sum is σ = 561124800. Its totient is φ = 472305600.

The previous prime is 515661103. The next prime is 515661169. The reversal of 515661121 is 121166515.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 515661121 - 2⁵ = 515661089 is a prime.

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 515661121.

It is not an unprimeable number, because it can be changed into a prime (515661101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64611 + ... + 72151.

It is an arithmetic number, because the mean of its divisors is an integer number (35070300).

Almost surely, 2^515661121 is an apocalyptic number.

It is an amenable number.

515661121 is a deficient number, since it is larger than the sum of its proper divisors (45463679).

515661121 is a wasteful number, since it uses less digits than its factorization.

515661121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7680.

The product of its digits is 1800, while the sum is 28.

The square root of 515661121 is about 22708.1730000456. The cubic root of 515661121 is about 801.9023068048.

The spelling of 515661121 in words is "five hundred fifteen million, six hundred sixty-one thousand, one hundred twenty-one".