9172561 has 16 divisors (see below), whose sum is σ = 10015488. Its totient is φ = 8377600.

The previous prime is 9172547. The next prime is 9172577. The reversal of 9172561 is 1652719.

It is a cyclic number.

It is not a de Polignac number, because 9172561 - 2⁷ = 9172433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9172531) 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 15 ways as a sum of consecutive naturals, for example, 66885 + ... + 67021.

It is an arithmetic number, because the mean of its divisors is an integer number (625968).

Almost surely, 2^9172561 is an apocalyptic number.

It is an amenable number.

9172561 is a deficient number, since it is larger than the sum of its proper divisors (842927).

9172561 is a wasteful number, since it uses less digits than its factorization.

9172561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272.

The product of its digits is 3780, while the sum is 31.

The square root of 9172561 is about 3028.6236147795. The cubic root of 9172561 is about 209.3293875839.

The spelling of 9172561 in words is "nine million, one hundred seventy-two thousand, five hundred sixty-one".