972208917 has 12 divisors (see below), whose sum is σ = 1404986700. Its totient is φ = 647823168.

The previous prime is 972208901. The next prime is 972208957. The reversal of 972208917 is 719802279.

It can be written as a sum of positive squares in 2 ways, for example, as 351900081 + 620308836 = 18759^2 + 24906^2 .

It is not a de Polignac number, because 972208917 - 2⁴ = 972208901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (972208957) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6042 + ... + 44507.

It is an arithmetic number, because the mean of its divisors is an integer number (117082225).

Almost surely, 2^972208917 is an apocalyptic number.

It is an amenable number.

972208917 is a deficient number, since it is larger than the sum of its proper divisors (432777783).

972208917 is a wasteful number, since it uses less digits than its factorization.

972208917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52692 (or 52689 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 972208917 is about 31180.2648641733. The cubic root of 972208917 is about 990.6491396188.

The spelling of 972208917 in words is "nine hundred seventy-two million, two hundred eight thousand, nine hundred seventeen".