139000391 has 2 divisors, whose sum is σ = 139000392. Its totient is φ = 139000390.

The previous prime is 139000343. The next prime is 139000423. The reversal of 139000391 is 193000931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139000391 - 2⁶ = 139000327 is a prime.

It is a super-2 number, since 2×139000391² = 38642217396305762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 139000391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139000331) 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, 69500195 + 69500196.

It is an arithmetic number, because the mean of its divisors is an integer number (69500196).

Almost surely, 2^139000391 is an apocalyptic number.

139000391 is a deficient number, since it is larger than the sum of its proper divisors (1).

139000391 is an equidigital number, since it uses as much as digits as its factorization.

139000391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 26.

The square root of 139000391 is about 11789.8427046335. The cubic root of 139000391 is about 518.0106324497.

The spelling of 139000391 in words is "one hundred thirty-nine million, three hundred ninety-one", and thus it is an aban number.