972247621 has 4 divisors (see below), whose sum is σ = 973072044. Its totient is φ = 971423200.

The previous prime is 972247603. The next prime is 972247643. The reversal of 972247621 is 126742279.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126742279 = 37 ⋅3425467.

It can be written as a sum of positive squares in 2 ways, for example, as 830304225 + 141943396 = 28815^2 + 11914^2 .

It is a cyclic number.

It is not a de Polignac number, because 972247621 - 2⁵ = 972247589 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 (972247691) 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, 410440 + ... + 412801.

It is an arithmetic number, because the mean of its divisors is an integer number (243268011).

Almost surely, 2^972247621 is an apocalyptic number.

It is an amenable number.

972247621 is a deficient number, since it is larger than the sum of its proper divisors (824423).

972247621 is a wasteful number, since it uses less digits than its factorization.

972247621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824422.

The product of its digits is 84672, while the sum is 40.

The square root of 972247621 is about 31180.8855069897. The cubic root of 972247621 is about 990.6622854818.

The spelling of 972247621 in words is "nine hundred seventy-two million, two hundred forty-seven thousand, six hundred twenty-one".