15604961 has 8 divisors (see below), whose sum is σ = 15845544. Its totient is φ = 15366400.

The previous prime is 15604957. The next prime is 15604999. The reversal of 15604961 is 16940651.

It can be written as a sum of positive squares in 4 ways, for example, as 4840000 + 10764961 = 2200^2 + 3281^2 .

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

It is a 4-Lehmer number, since φ(15604961) divides (15604961-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 15604961 - 2² = 15604957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15604931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21911 + ... + 22611.

It is an arithmetic number, because the mean of its divisors is an integer number (1980693).

Almost surely, 2^15604961 is an apocalyptic number.

It is an amenable number.

15604961 is a deficient number, since it is larger than the sum of its proper divisors (240583).

15604961 is a wasteful number, since it uses less digits than its factorization.

15604961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 15604961 is about 3950.3115067042. The cubic root of 15604961 is about 249.8930796120.

The spelling of 15604961 in words is "fifteen million, six hundred four thousand, nine hundred sixty-one".