972531709 has 4 divisors (see below), whose sum is σ = 979528480. Its totient is φ = 965534940.

The previous prime is 972531691. The next prime is 972531719. The reversal of 972531709 is 907135279.

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: 907135279 = 20717 ⋅43787.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-972531709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (972531719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3498177 + ... + 3498454.

It is an arithmetic number, because the mean of its divisors is an integer number (244882120).

Almost surely, 2^972531709 is an apocalyptic number.

It is an amenable number.

972531709 is a deficient number, since it is larger than the sum of its proper divisors (6996771).

972531709 is a wasteful number, since it uses less digits than its factorization.

972531709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6996770.

The product of its (nonzero) digits is 119070, while the sum is 43.

The square root of 972531709 is about 31185.4406574607. The cubic root of 972531709 is about 990.7587656562.

The spelling of 972531709 in words is "nine hundred seventy-two million, five hundred thirty-one thousand, seven hundred nine".