9521972751 has 4 divisors (see below), whose sum is σ = 12695963672. Its totient is φ = 6347981832.

The previous prime is 9521972689. The next prime is 9521972809. The reversal of 9521972751 is 1572791259.

It is a happy number.

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

It is not a de Polignac number, because 9521972751 - 2⁶ = 9521972687 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9521972751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9521972651) 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, 1586995456 + ... + 1586995461.

It is an arithmetic number, because the mean of its divisors is an integer number (3173990918).

Almost surely, 2^9521972751 is an apocalyptic number.

9521972751 is a deficient number, since it is larger than the sum of its proper divisors (3173990921).

9521972751 is a wasteful number, since it uses less digits than its factorization.

9521972751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3173990920.

The product of its digits is 396900, while the sum is 48.

The square root of 9521972751 is about 97580.5961807982. The cubic root of 9521972751 is about 2119.5433891863.

The spelling of 9521972751 in words is "nine billion, five hundred twenty-one million, nine hundred seventy-two thousand, seven hundred fifty-one".