972359021 has 4 divisors (see below), whose sum is σ = 975145500. Its totient is φ = 969572544.

The previous prime is 972358997. The next prime is 972359023. The reversal of 972359021 is 120953279.

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 803098921 + 169260100 = 28339^2 + 13010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-972359021 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 (972359023) 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, 1392716 + ... + 1393413.

It is an arithmetic number, because the mean of its divisors is an integer number (243786375).

Almost surely, 2^972359021 is an apocalyptic number.

It is an amenable number.

972359021 is a deficient number, since it is larger than the sum of its proper divisors (2786479).

972359021 is a wasteful number, since it uses less digits than its factorization.

972359021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2786478.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 972359021 is about 31182.6718066300. The cubic root of 972359021 is about 990.7001206867.

The spelling of 972359021 in words is "nine hundred seventy-two million, three hundred fifty-nine thousand, twenty-one".