9972751 has 4 divisors (see below), whose sum is σ = 9990000. Its totient is φ = 9955504.

The previous prime is 9972733. The next prime is 9972757. The reversal of 9972751 is 1572799.

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

It is a cyclic number.

It is not a de Polignac number, because 9972751 - 2⁷ = 9972623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9972757) 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, 7726 + ... + 8923.

It is an arithmetic number, because the mean of its divisors is an integer number (2497500).

Almost surely, 2^9972751 is an apocalyptic number.

9972751 is a deficient number, since it is larger than the sum of its proper divisors (17249).

9972751 is a wasteful number, since it uses less digits than its factorization.

9972751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17248.

The product of its digits is 39690, while the sum is 40.

The square root of 9972751 is about 3157.9662759441. The cubic root of 9972751 is about 215.2476036880.

The spelling of 9972751 in words is "nine million, nine hundred seventy-two thousand, seven hundred fifty-one".