16572561 has 4 divisors (see below), whose sum is σ = 22096752. Its totient is φ = 11048372.

The previous prime is 16572551. The next prime is 16572593. The reversal of 16572561 is 16527561.

16572561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 16572561 - 2¹⁰ = 16571537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16572551) 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, 2762091 + ... + 2762096.

It is an arithmetic number, because the mean of its divisors is an integer number (5524188).

Almost surely, 2^16572561 is an apocalyptic number.

It is an amenable number.

16572561 is a deficient number, since it is larger than the sum of its proper divisors (5524191).

16572561 is an equidigital number, since it uses as much as digits as its factorization.

16572561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5524190.

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

The square root of 16572561 is about 4070.9410459991. The cubic root of 16572561 is about 254.9548093698.

The spelling of 16572561 in words is "sixteen million, five hundred seventy-two thousand, five hundred sixty-one".