139161931 has 2 divisors, whose sum is σ = 139161932. Its totient is φ = 139161930.

The previous prime is 139161929. The next prime is 139162003.

139161931 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 139161931 - 2¹ = 139161929 is a prime.

It is a super-2 number, since 2×139161931² = 38732086079297522, which contains 22 as substring.

Together with 139161929, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (139162931) 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, 69580965 + 69580966.

It is an arithmetic number, because the mean of its divisors is an integer number (69580966).

Almost surely, 2^139161931 is an apocalyptic number.

139161931 is a deficient number, since it is larger than the sum of its proper divisors (1).

139161931 is an equidigital number, since it uses as much as digits as its factorization.

139161931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 34.

The square root of 139161931 is about 11796.6915277123. The cubic root of 139161931 is about 518.2112243131.

The spelling of 139161931 in words is "one hundred thirty-nine million, one hundred sixty-one thousand, nine hundred thirty-one".