974609521 has 4 divisors (see below), whose sum is σ = 1016983872. Its totient is φ = 932235172.

The previous prime is 974609509. The next prime is 974609549. The reversal of 974609521 is 125906479.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125906479 = 103 ⋅1222393.

It is a de Polignac number, because none of the positive numbers 2^k-974609521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (974609501) 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, 21187141 + ... + 21187186.

It is an arithmetic number, because the mean of its divisors is an integer number (254245968).

Almost surely, 2^974609521 is an apocalyptic number.

It is an amenable number.

974609521 is a deficient number, since it is larger than the sum of its proper divisors (42374351).

974609521 is a wasteful number, since it uses less digits than its factorization.

974609521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42374350.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 974609521 is about 31218.7366976949. The cubic root of 974609521 is about 991.4638484481.

The spelling of 974609521 in words is "nine hundred seventy-four million, six hundred nine thousand, five hundred twenty-one".