974681921 has 4 divisors (see below), whose sum is σ = 974746500. Its totient is φ = 974617344.

The previous prime is 974681891. The next prime is 974681941. The reversal of 974681921 is 129186479.

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 can be written as a sum of positive squares in 2 ways, for example, as 740928400 + 233753521 = 27220^2 + 15289^2 .

It is a cyclic number.

It is not a de Polignac number, because 974681921 - 2¹⁰ = 974680897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (974681941) 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, 3785 + ... + 44313.

It is an arithmetic number, because the mean of its divisors is an integer number (243686625).

Almost surely, 2^974681921 is an apocalyptic number.

It is an amenable number.

974681921 is a deficient number, since it is larger than the sum of its proper divisors (64579).

974681921 is a wasteful number, since it uses less digits than its factorization.

974681921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64578.

The product of its digits is 217728, while the sum is 47.

The square root of 974681921 is about 31219.8962362145. The cubic root of 974681921 is about 991.4883985213.

The spelling of 974681921 in words is "nine hundred seventy-four million, six hundred eighty-one thousand, nine hundred twenty-one".