972116851 has 2 divisors, whose sum is σ = 972116852. Its totient is φ = 972116850.

The previous prime is 972116843. The next prime is 972116861. The reversal of 972116851 is 158611279.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (158611279) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 972116851 - 2³ = 972116843 is a prime.

It is a super-2 number, since 2×972116851² = 1890022343996312402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (972116861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 486058425 + 486058426.

It is an arithmetic number, because the mean of its divisors is an integer number (486058426).

Almost surely, 2^972116851 is an apocalyptic number.

972116851 is a deficient number, since it is larger than the sum of its proper divisors (1).

972116851 is an equidigital number, since it uses as much as digits as its factorization.

972116851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 40.

The square root of 972116851 is about 31178.7884787078. The cubic root of 972116851 is about 990.6178678825.

The spelling of 972116851 in words is "nine hundred seventy-two million, one hundred sixteen thousand, eight hundred fifty-one".