973764521 has 4 divisors (see below), whose sum is σ = 982865232. Its totient is φ = 964663812.

The previous prime is 973764487. The next prime is 973764559. The reversal of 973764521 is 125467379.

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: 125467379 = 433 ⋅289763.

It is a cyclic number.

It is not a de Polignac number, because 973764521 - 2²⁶ = 906655657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (973764821) 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, 4550195 + ... + 4550408.

It is an arithmetic number, because the mean of its divisors is an integer number (245716308).

Almost surely, 2^973764521 is an apocalyptic number.

It is an amenable number.

973764521 is a deficient number, since it is larger than the sum of its proper divisors (9100711).

973764521 is a wasteful number, since it uses less digits than its factorization.

973764521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9100710.

The product of its digits is 317520, while the sum is 44.

The square root of 973764521 is about 31205.2002236807. The cubic root of 973764521 is about 991.1772279521.

The spelling of 973764521 in words is "nine hundred seventy-three million, seven hundred sixty-four thousand, five hundred twenty-one".