972761721 has 8 divisors (see below), whose sum is σ = 1297197600. Its totient is φ = 648416832.

The previous prime is 972761659. The next prime is 972761737. The reversal of 972761721 is 127167279.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 972761721 - 2⁷ = 972761593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (972761521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8226 + ... + 44868.

It is an arithmetic number, because the mean of its divisors is an integer number (162149700).

Almost surely, 2^972761721 is an apocalyptic number.

It is an amenable number.

972761721 is a deficient number, since it is larger than the sum of its proper divisors (324435879).

972761721 is a wasteful number, since it uses less digits than its factorization.

972761721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45495.

The product of its digits is 74088, while the sum is 42.

The square root of 972761721 is about 31189.1282500810. The cubic root of 972761721 is about 990.8368671172.

The spelling of 972761721 in words is "nine hundred seventy-two million, seven hundred sixty-one thousand, seven hundred twenty-one".