84999931 has 2 divisors, whose sum is σ = 84999932. Its totient is φ = 84999930.

The previous prime is 84999913. The next prime is 84999979. The reversal of 84999931 is 13999948.

Together with previous prime (84999913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84999931 - 2⁹ = 84999419 is a prime.

It is a super-2 number, since 2×84999931² = 14449976540009522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (84999731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42499965 + 42499966.

It is an arithmetic number, because the mean of its divisors is an integer number (42499966).

Almost surely, 2^84999931 is an apocalyptic number.

84999931 is a deficient number, since it is larger than the sum of its proper divisors (1).

84999931 is an equidigital number, since it uses as much as digits as its factorization.

84999931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 52.

The square root of 84999931 is about 9219.5407152417. The cubic root of 84999931 is about 439.6828482427.

The spelling of 84999931 in words is "eighty-four million, nine hundred ninety-nine thousand, nine hundred thirty-one".