15960121 has 8 divisors (see below), whose sum is σ = 16677000. Its totient is φ = 15254400.

The previous prime is 15960097. The next prime is 15960163. The reversal of 15960121 is 12106951.

15960121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3258025 + 12702096 = 1805^2 + 3564^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15960121 - 2¹⁷ = 15829049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15960221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205 + ... + 5653.

It is an arithmetic number, because the mean of its divisors is an integer number (2084625).

Almost surely, 2^15960121 is an apocalyptic number.

It is an amenable number.

15960121 is a deficient number, since it is larger than the sum of its proper divisors (716879).

15960121 is a wasteful number, since it uses less digits than its factorization.

15960121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5579.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 15960121 is about 3995.0120150007. The cubic root of 15960121 is about 251.7746841743.

The spelling of 15960121 in words is "fifteen million, nine hundred sixty thousand, one hundred twenty-one".