9972561 has 4 divisors (see below), whose sum is σ = 13296752. Its totient is φ = 6648372.

The previous prime is 9972559. The next prime is 9972569. The reversal of 9972561 is 1652799.

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 not a de Polignac number, because 9972561 - 2¹ = 9972559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9972569) 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, 1662091 + ... + 1662096.

It is an arithmetic number, because the mean of its divisors is an integer number (3324188).

Almost surely, 2^9972561 is an apocalyptic number.

It is an amenable number.

9972561 is a deficient number, since it is larger than the sum of its proper divisors (3324191).

9972561 is a wasteful number, since it uses less digits than its factorization.

9972561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3324190.

The product of its digits is 34020, while the sum is 39.

The square root of 9972561 is about 3157.9361931489. The cubic root of 9972561 is about 215.2462367196.

The spelling of 9972561 in words is "nine million, nine hundred seventy-two thousand, five hundred sixty-one".