9121565725 has 12 divisors (see below), whose sum is σ = 11392118080. Its totient is φ = 7244751600.

The previous prime is 9121565707. The next prime is 9121565741. The reversal of 9121565725 is 5275651219.

It is not a de Polignac number, because 9121565725 - 2⁵ = 9121565693 is a prime.

It is a super-2 number, since 2×9121565725² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1308981 + ... + 1315930.

Almost surely, 2^9121565725 is an apocalyptic number.

It is an amenable number.

9121565725 is a deficient number, since it is larger than the sum of its proper divisors (2270552355).

9121565725 is a wasteful number, since it uses less digits than its factorization.

9121565725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2625060 (or 2625055 counting only the distinct ones).

The product of its digits is 189000, while the sum is 43.

The square root of 9121565725 is about 95506.8883641384. Note that the first 3 decimals coincide. The cubic root of 9121565725 is about 2089.4074100423.

The spelling of 9121565725 in words is "nine billion, one hundred twenty-one million, five hundred sixty-five thousand, seven hundred twenty-five".