139969931 has 2 divisors, whose sum is σ = 139969932. Its totient is φ = 139969930.

The previous prime is 139969877. The next prime is 139969939.

139969931 is nontrivially palindromic in base 10.

139969931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-139969931 is a prime.

It is a super-2 number, since 2×139969931² = 39183163168289522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139969931.

It is not a weakly prime, because it can be changed into another prime (139969939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69984965 + 69984966.

It is an arithmetic number, because the mean of its divisors is an integer number (69984966).

Almost surely, 2^139969931 is an apocalyptic number.

139969931 is a deficient number, since it is larger than the sum of its proper divisors (1).

139969931 is an equidigital number, since it uses as much as digits as its factorization.

139969931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 354294, while the sum is 50.

The square root of 139969931 is about 11830.8888508007. Note that the first 4 decimals coincide. The cubic root of 139969931 is about 519.2122329745.

The spelling of 139969931 in words is "one hundred thirty-nine million, nine hundred sixty-nine thousand, nine hundred thirty-one".