84890831 has 2 divisors, whose sum is σ = 84890832. Its totient is φ = 84890830.

The previous prime is 84890779. The next prime is 84890837. The reversal of 84890831 is 13809848.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84890831 is a prime.

It is a super-2 number, since 2×84890831² = 14412906375741122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84890837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42445415 + 42445416.

It is an arithmetic number, because the mean of its divisors is an integer number (42445416).

Almost surely, 2^84890831 is an apocalyptic number.

84890831 is a deficient number, since it is larger than the sum of its proper divisors (1).

84890831 is an equidigital number, since it uses as much as digits as its factorization.

84890831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 84890831 is about 9213.6220347917. The cubic root of 84890831 is about 439.4946522594.

The spelling of 84890831 in words is "eighty-four million, eight hundred ninety thousand, eight hundred thirty-one".