139606931 has 2 divisors, whose sum is σ = 139606932. Its totient is φ = 139606930.

The previous prime is 139606903. The next prime is 139606937.

139606931 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139606931 is a prime.

It is a super-2 number, since 2×139606931² = 38980190366477522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139606937) 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, 69803465 + 69803466.

It is an arithmetic number, because the mean of its divisors is an integer number (69803466).

Almost surely, 2^139606931 is an apocalyptic number.

139606931 is a deficient number, since it is larger than the sum of its proper divisors (1).

139606931 is an equidigital number, since it uses as much as digits as its factorization.

139606931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 139606931 is about 11815.5376940705. The cubic root of 139606931 is about 518.7630002839.

The spelling of 139606931 in words is "one hundred thirty-nine million, six hundred six thousand, nine hundred thirty-one".