972608491 has 4 divisors (see below), whose sum is σ = 972680584. Its totient is φ = 972536400.

The previous prime is 972608489. The next prime is 972608551. The reversal of 972608491 is 194806279.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 972608491 - 2¹ = 972608489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (972608401) 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, 9090 + ... + 45031.

It is an arithmetic number, because the mean of its divisors is an integer number (243170146).

Almost surely, 2^972608491 is an apocalyptic number.

972608491 is a deficient number, since it is larger than the sum of its proper divisors (72093).

972608491 is a wasteful number, since it uses less digits than its factorization.

972608491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72092.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 972608491 is about 31186.6716883992. The cubic root of 972608491 is about 990.7848386493.

The spelling of 972608491 in words is "nine hundred seventy-two million, six hundred eight thousand, four hundred ninety-one".