139683931 has 2 divisors, whose sum is σ = 139683932. Its totient is φ = 139683930.

The previous prime is 139683919. The next prime is 139683959. The reversal of 139683931 is 139386931.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (139386931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139683931 is a prime.

It is a super-2 number, since 2×139683931² = 39023201159225522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (139684931) 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, 69841965 + 69841966.

It is an arithmetic number, because the mean of its divisors is an integer number (69841966).

Almost surely, 2^139683931 is an apocalyptic number.

139683931 is a deficient number, since it is larger than the sum of its proper divisors (1).

139683931 is an equidigital number, since it uses as much as digits as its factorization.

139683931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 43.

The square root of 139683931 is about 11818.7956662259. The cubic root of 139683931 is about 518.8583570811.

The spelling of 139683931 in words is "one hundred thirty-nine million, six hundred eighty-three thousand, nine hundred thirty-one".