972521 has 4 divisors (see below), whose sum is σ = 1060944. Its totient is φ = 884100.

The previous prime is 972493. The next prime is 972533. The reversal of 972521 is 125279.

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.

It is a cyclic number.

It is not a de Polignac number, because 972521 - 2¹⁸ = 710377 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 972521.

It is not an unprimeable number, because it can be changed into a prime (972581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44195 + ... + 44216.

It is an arithmetic number, because the mean of its divisors is an integer number (265236).

2⁹⁷²⁵²¹ is an apocalyptic number.

It is an amenable number.

972521 is a deficient number, since it is larger than the sum of its proper divisors (88423).

972521 is a wasteful number, since it uses less digits than its factorization.

972521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88422.

The product of its digits is 1260, while the sum is 26.

The square root of 972521 is about 986.1647935310. The cubic root of 972521 is about 99.0755129074.

The spelling of 972521 in words is "nine hundred seventy-two thousand, five hundred twenty-one".