84731039 has 2 divisors, whose sum is σ = 84731040. Its totient is φ = 84731038.

The previous prime is 84730991. The next prime is 84731093. The reversal of 84731039 is 93013748.

Together with next prime (84731093) 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-84731039 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84731099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42365519 + 42365520.

It is an arithmetic number, because the mean of its divisors is an integer number (42365520).

Almost surely, 2^84731039 is an apocalyptic number.

84731039 is a deficient number, since it is larger than the sum of its proper divisors (1).

84731039 is an equidigital number, since it uses as much as digits as its factorization.

84731039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 84731039 is about 9204.9464419952. The cubic root of 84731039 is about 439.2187220302.

The spelling of 84731039 in words is "eighty-four million, seven hundred thirty-one thousand, thirty-nine".