15921145 has 16 divisors (see below), whose sum is σ = 20808000. Its totient is φ = 11648448.

The previous prime is 15921133. The next prime is 15921151. The reversal of 15921145 is 54112951.

It is a cyclic number.

It is not a de Polignac number, because 15921145 - 2¹¹ = 15919097 is a prime.

It is a super-2 number, since 2×15921145² = 506965716222050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135 + ... + 5644.

It is an arithmetic number, because the mean of its divisors is an integer number (1300500).

Almost surely, 2^15921145 is an apocalyptic number.

It is an amenable number.

15921145 is a deficient number, since it is larger than the sum of its proper divisors (4886855).

15921145 is a wasteful number, since it uses less digits than its factorization.

15921145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5832.

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

The square root of 15921145 is about 3990.1309502321. The cubic root of 15921145 is about 251.5695652376.

The spelling of 15921145 in words is "fifteen million, nine hundred twenty-one thousand, one hundred forty-five".