972415621 has 2 divisors, whose sum is σ = 972415622. Its totient is φ = 972415620.

The previous prime is 972415607. The next prime is 972415627. The reversal of 972415621 is 126514279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 966339396 + 6076225 = 31086^2 + 2465^2 .

It is an emirp because it is prime and its reverse (126514279) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-972415621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (972415627) 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 as a sum of consecutive naturals, namely, 486207810 + 486207811.

It is an arithmetic number, because the mean of its divisors is an integer number (486207811).

Almost surely, 2^972415621 is an apocalyptic number.

It is an amenable number.

972415621 is a deficient number, since it is larger than the sum of its proper divisors (1).

972415621 is an equidigital number, since it uses as much as digits as its factorization.

972415621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 972415621 is about 31183.5793487534. The cubic root of 972415621 is about 990.7193428524.

The spelling of 972415621 in words is "nine hundred seventy-two million, four hundred fifteen thousand, six hundred twenty-one".