138191558 has 4 divisors (see below), whose sum is σ = 207287340. Its totient is φ = 69095778.

The previous prime is 138191549. The next prime is 138191663. The reversal of 138191558 is 855191831.

138191558 is digitally balanced in base 3, 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 congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34547888 + ... + 34547891.

It is an arithmetic number, because the mean of its divisors is an integer number (51821835).

Almost surely, 2^138191558 is an apocalyptic number.

138191558 is a deficient number, since it is larger than the sum of its proper divisors (69095782).

138191558 is an equidigital number, since it uses as much as digits as its factorization.

138191558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69095781.

The product of its digits is 43200, while the sum is 41.

The square root of 138191558 is about 11755.4905469742. The cubic root of 138191558 is about 517.0039220671.

The spelling of 138191558 in words is "one hundred thirty-eight million, one hundred ninety-one thousand, five hundred fifty-eight".