9992501521 has 4 divisors (see below), whose sum is σ = 10080930852. Its totient is φ = 9904072192.

The previous prime is 9992501507. The next prime is 9992501539. The reversal of 9992501521 is 1251052999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4894541521 + 5097960000 = 69961^2 + 71400^2 .

It is a cyclic number.

It is not a de Polignac number, because 9992501521 - 2¹⁵ = 9992468753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9992501821) 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, 44214496 + ... + 44214721.

It is an arithmetic number, because the mean of its divisors is an integer number (2520232713).

Almost surely, 2^9992501521 is an apocalyptic number.

It is an amenable number.

9992501521 is a deficient number, since it is larger than the sum of its proper divisors (88429331).

9992501521 is a wasteful number, since it uses less digits than its factorization.

9992501521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88429330.

The product of its (nonzero) digits is 72900, while the sum is 43.

The square root of 9992501521 is about 99962.5005739652. The cubic root of 9992501521 is about 2153.8960559356.

The spelling of 9992501521 in words is "nine billion, nine hundred ninety-two million, five hundred one thousand, five hundred twenty-one".