15672561 has 4 divisors (see below), whose sum is σ = 20896752. Its totient is φ = 10448372.

The previous prime is 15672551. The next prime is 15672563. The reversal of 15672561 is 16527651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15672561 - 2⁵ = 15672529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15672563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2612091 + ... + 2612096.

It is an arithmetic number, because the mean of its divisors is an integer number (5224188).

Almost surely, 2^15672561 is an apocalyptic number.

It is an amenable number.

15672561 is a deficient number, since it is larger than the sum of its proper divisors (5224191).

15672561 is an equidigital number, since it uses as much as digits as its factorization.

15672561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5224190.

The product of its digits is 12600, while the sum is 33.

The square root of 15672561 is about 3958.8585476119. The cubic root of 15672561 is about 250.2534017301.

The spelling of 15672561 in words is "fifteen million, six hundred seventy-two thousand, five hundred sixty-one".