8139431 has 2 divisors, whose sum is σ = 8139432. Its totient is φ = 8139430.

The previous prime is 8139421. The next prime is 8139451. The reversal of 8139431 is 1349318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8139431 - 2²² = 3945127 is a prime.

It is a super-2 number, since 2×8139431² = 132500674007522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 8139394 and 8139403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8139421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4069715 + 4069716.

It is an arithmetic number, because the mean of its divisors is an integer number (4069716).

Almost surely, 2^8139431 is an apocalyptic number.

8139431 is a deficient number, since it is larger than the sum of its proper divisors (1).

8139431 is an equidigital number, since it uses as much as digits as its factorization.

8139431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 8139431 is about 2852.9688045964. The cubic root of 8139431 is about 201.1552392633.

The spelling of 8139431 in words is "eight million, one hundred thirty-nine thousand, four hundred thirty-one".