972116861 has 2 divisors, whose sum is σ = 972116862. Its totient is φ = 972116860.

The previous prime is 972116851. The next prime is 972116897. The reversal of 972116861 is 168611279.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 743925625 + 228191236 = 27275^2 + 15106^2 .

It is a cyclic number.

It is not a de Polignac number, because 972116861 - 2¹⁸ = 971854717 is a prime.

It is a super-2 number, since 2×972116861² = 1890022382880986642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (972116851) 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 as a sum of consecutive naturals, namely, 486058430 + 486058431.

It is an arithmetic number, because the mean of its divisors is an integer number (486058431).

Almost surely, 2^972116861 is an apocalyptic number.

It is an amenable number.

972116861 is a deficient number, since it is larger than the sum of its proper divisors (1).

972116861 is an equidigital number, since it uses as much as digits as its factorization.

972116861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 41.

The square root of 972116861 is about 31178.7886390732. The cubic root of 972116861 is about 990.6178712792.

The spelling of 972116861 in words is "nine hundred seventy-two million, one hundred sixteen thousand, eight hundred sixty-one".