84904396831 has 2 divisors, whose sum is σ = 84904396832. Its totient is φ = 84904396830.

The previous prime is 84904396813. The next prime is 84904396853. The reversal of 84904396831 is 13869340948.

Together with previous prime (84904396813) 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 a de Polignac number, because none of the positive numbers 2^k-84904396831 is a prime.

It is a super-2 number, since 2×84904396831² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84904394831) 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, 42452198415 + 42452198416.

It is an arithmetic number, because the mean of its divisors is an integer number (42452198416).

Almost surely, 2^84904396831 is an apocalyptic number.

84904396831 is a deficient number, since it is larger than the sum of its proper divisors (1).

84904396831 is an equidigital number, since it uses as much as digits as its factorization.

84904396831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4478976, while the sum is 55.

The spelling of 84904396831 in words is "eighty-four billion, nine hundred four million, three hundred ninety-six thousand, eight hundred thirty-one".