139186913 has 4 divisors (see below), whose sum is σ = 146512560. Its totient is φ = 131861268.

The previous prime is 139186907. The next prime is 139186919. The reversal of 139186913 is 319681931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 319681931 = 619 ⋅516449.

It is an interprime number because it is at equal distance from previous prime (139186907) and next prime (139186919).

It is a cyclic number.

It is not a de Polignac number, because 139186913 - 2⁶ = 139186849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139186919) 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 in 3 ways as a sum of consecutive naturals, for example, 3662795 + ... + 3662832.

It is an arithmetic number, because the mean of its divisors is an integer number (36628140).

Almost surely, 2^139186913 is an apocalyptic number.

It is an amenable number.

139186913 is a deficient number, since it is larger than the sum of its proper divisors (7325647).

139186913 is an equidigital number, since it uses as much as digits as its factorization.

139186913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7325646.

The product of its digits is 34992, while the sum is 41.

The square root of 139186913 is about 11797.7503363989. The cubic root of 139186913 is about 518.2422317831.

The spelling of 139186913 in words is "one hundred thirty-nine million, one hundred eighty-six thousand, nine hundred thirteen".