139173019 has 4 divisors (see below), whose sum is σ = 139786344. Its totient is φ = 138559696.

The previous prime is 139173017. The next prime is 139173029. The reversal of 139173019 is 910371931.

139173019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139173019 - 2¹ = 139173017 is a prime.

It is a super-2 number, since 2×139173019² = 38738258435148722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139173017) 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, 306322 + ... + 306775.

It is an arithmetic number, because the mean of its divisors is an integer number (34946586).

Almost surely, 2^139173019 is an apocalyptic number.

139173019 is a deficient number, since it is larger than the sum of its proper divisors (613325).

139173019 is an equidigital number, since it uses as much as digits as its factorization.

139173019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613324.

The product of its (nonzero) digits is 5103, while the sum is 34.

The square root of 139173019 is about 11797.1614806274. The cubic root of 139173019 is about 518.2249871131.

The spelling of 139173019 in words is "one hundred thirty-nine million, one hundred seventy-three thousand, nineteen".