84731831 has 2 divisors, whose sum is σ = 84731832. Its totient is φ = 84731830.

The previous prime is 84731819. The next prime is 84731833. The reversal of 84731831 is 13813748.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84731831 - 2¹⁴ = 84715447 is a prime.

It is a super-2 number, since 2×84731831² = 14358966369225122, which contains 22 as substring.

Together with 84731833, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 84731791 and 84731800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84731833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42365915 + 42365916.

It is an arithmetic number, because the mean of its divisors is an integer number (42365916).

Almost surely, 2^84731831 is an apocalyptic number.

84731831 is a deficient number, since it is larger than the sum of its proper divisors (1).

84731831 is an equidigital number, since it uses as much as digits as its factorization.

84731831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 84731831 is about 9204.9894622427. The cubic root of 84731831 is about 439.2200905179.

The spelling of 84731831 in words is "eighty-four million, seven hundred thirty-one thousand, eight hundred thirty-one".