139319391 has 4 divisors (see below), whose sum is σ = 185759192. Its totient is φ = 92879592.

The previous prime is 139319387. The next prime is 139319399. The reversal of 139319391 is 193913931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193913931 = 3 ⋅64637977.

It is not a de Polignac number, because 139319391 - 2² = 139319387 is a prime.

It is a super-2 number, since 2×139319391² = 38819785417221762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139319399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23219896 + ... + 23219901.

It is an arithmetic number, because the mean of its divisors is an integer number (46439798).

Almost surely, 2^139319391 is an apocalyptic number.

139319391 is a deficient number, since it is larger than the sum of its proper divisors (46439801).

139319391 is an equidigital number, since it uses as much as digits as its factorization.

139319391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46439800.

The product of its digits is 19683, while the sum is 39.

The square root of 139319391 is about 11803.3635460406. The cubic root of 139319391 is about 518.4066005020.

The spelling of 139319391 in words is "one hundred thirty-nine million, three hundred nineteen thousand, three hundred ninety-one".