84731819 has 2 divisors, whose sum is σ = 84731820. Its totient is φ = 84731818.

The previous prime is 84731809. The next prime is 84731831. The reversal of 84731819 is 91813748.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84731819 - 2¹² = 84727723 is a prime.

It is a super-2 number, since 2×84731819² = 14358962302097522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84731809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42365909 + 42365910.

It is an arithmetic number, because the mean of its divisors is an integer number (42365910).

Almost surely, 2^84731819 is an apocalyptic number.

84731819 is a deficient number, since it is larger than the sum of its proper divisors (1).

84731819 is an equidigital number, since it uses as much as digits as its factorization.

84731819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 84731819 is about 9204.9888104223. The cubic root of 84731819 is about 439.2200697833.

The spelling of 84731819 in words is "eighty-four million, seven hundred thirty-one thousand, eight hundred nineteen".