84997931 has 2 divisors, whose sum is σ = 84997932. Its totient is φ = 84997930.

The previous prime is 84997919. The next prime is 84997933. The reversal of 84997931 is 13979948.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84997931 - 2¹⁰ = 84996907 is a prime.

It is a super-2 number, since 2×84997931² = 14449296548561522, which contains 22 as substring.

Together with 84997933, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84997931.

It is not a weakly prime, because it can be changed into another prime (84997933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42498965 + 42498966.

It is an arithmetic number, because the mean of its divisors is an integer number (42498966).

Almost surely, 2^84997931 is an apocalyptic number.

84997931 is a deficient number, since it is larger than the sum of its proper divisors (1).

84997931 is an equidigital number, since it uses as much as digits as its factorization.

84997931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 50.

The square root of 84997931 is about 9219.4322493308. The cubic root of 84997931 is about 439.6793997200.

The spelling of 84997931 in words is "eighty-four million, nine hundred ninety-seven thousand, nine hundred thirty-one".