972943809 has 4 divisors (see below), whose sum is σ = 1297258416. Its totient is φ = 648629204.

The previous prime is 972943799. The next prime is 972943859. The reversal of 972943809 is 908349279.

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 972943809 - 2⁸ = 972943553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (972943859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162157299 + ... + 162157304.

It is an arithmetic number, because the mean of its divisors is an integer number (324314604).

Almost surely, 2^972943809 is an apocalyptic number.

It is an amenable number.

972943809 is a deficient number, since it is larger than the sum of its proper divisors (324314607).

972943809 is a wasteful number, since it uses less digits than its factorization.

972943809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324314606.

The product of its (nonzero) digits is 979776, while the sum is 51.

The square root of 972943809 is about 31192.0472075816. The cubic root of 972943809 is about 990.8986870687.

The spelling of 972943809 in words is "nine hundred seventy-two million, nine hundred forty-three thousand, eight hundred nine".