138700091 has 8 divisors (see below), whose sum is σ = 141523200. Its totient is φ = 135892840.

The previous prime is 138700027. The next prime is 138700103. The reversal of 138700091 is 190007831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138700091 - 2⁶ = 138700027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138700291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14570 + ... + 22128.

It is an arithmetic number, because the mean of its divisors is an integer number (17690400).

Almost surely, 2^138700091 is an apocalyptic number.

138700091 is a deficient number, since it is larger than the sum of its proper divisors (2823109).

138700091 is an equidigital number, since it uses as much as digits as its factorization.

138700091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7929.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 138700091 is about 11777.1002797802. The cubic root of 138700091 is about 517.6373223444.

The spelling of 138700091 in words is "one hundred thirty-eight million, seven hundred thousand, ninety-one".