139191719 has 4 divisors (see below), whose sum is σ = 139769520. Its totient is φ = 138613920.

The previous prime is 139191709. The next prime is 139191749. The reversal of 139191719 is 917191931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 917191931 = 383 ⋅2394757.

It is a cyclic number.

It is not a de Polignac number, because 139191719 - 2⁸ = 139191463 is a prime.

It is a super-2 number, since 2×139191719² = 38748669276349922, 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 (139191709) 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, 288539 + ... + 289020.

It is an arithmetic number, because the mean of its divisors is an integer number (34942380).

Almost surely, 2^139191719 is an apocalyptic number.

139191719 is a deficient number, since it is larger than the sum of its proper divisors (577801).

139191719 is an equidigital number, since it uses as much as digits as its factorization.

139191719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577800.

The product of its digits is 15309, while the sum is 41.

The square root of 139191719 is about 11797.9540175405. The cubic root of 139191719 is about 518.2481965285.

The spelling of 139191719 in words is "one hundred thirty-nine million, one hundred ninety-one thousand, seven hundred nineteen".