972998921 has 4 divisors (see below), whose sum is σ = 996730644. Its totient is φ = 949267200.

The previous prime is 972998903. The next prime is 972998941. The reversal of 972998921 is 129899279.

It is a happy number.

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 14167696 + 958831225 = 3764^2 + 30965^2 .

It is a cyclic number.

It is not a de Polignac number, because 972998921 - 2¹⁰ = 972997897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (972998941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11865800 + ... + 11865881.

It is an arithmetic number, because the mean of its divisors is an integer number (249182661).

Almost surely, 2^972998921 is an apocalyptic number.

It is an amenable number.

972998921 is a deficient number, since it is larger than the sum of its proper divisors (23731723).

972998921 is a wasteful number, since it uses less digits than its factorization.

972998921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23731722.

The product of its digits is 1469664, while the sum is 56.

The square root of 972998921 is about 31192.9306253837. The cubic root of 972998921 is about 990.9173963976.

The spelling of 972998921 in words is "nine hundred seventy-two million, nine hundred ninety-eight thousand, nine hundred twenty-one".