139383931 has 2 divisors, whose sum is σ = 139383932. Its totient is φ = 139383930.

The previous prime is 139383929. The next prime is 139383961.

139383931 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 139383931 - 2¹ = 139383929 is a prime.

It is a super-2 number, since 2×139383931² = 38855760442025522, which contains 22 as substring.

Together with 139383929, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (139383961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69691965 + 69691966.

It is an arithmetic number, because the mean of its divisors is an integer number (69691966).

Almost surely, 2^139383931 is an apocalyptic number.

139383931 is a deficient number, since it is larger than the sum of its proper divisors (1).

139383931 is an equidigital number, since it uses as much as digits as its factorization.

139383931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52488, while the sum is 40.

The square root of 139383931 is about 11806.0971959407. The cubic root of 139383931 is about 518.4866391255.

The spelling of 139383931 in words is "one hundred thirty-nine million, three hundred eighty-three thousand, nine hundred thirty-one".