138285091 has 8 divisors (see below), whose sum is σ = 158124384. Its totient is φ = 118466880.

The previous prime is 138285083. The next prime is 138285107. The reversal of 138285091 is 190582831.

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

It is not a de Polignac number, because 138285091 - 2³ = 138285083 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138285091.

It is not an unprimeable number, because it can be changed into a prime (138285011) 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, 13041 + ... + 21133.

It is an arithmetic number, because the mean of its divisors is an integer number (19765548).

Almost surely, 2^138285091 is an apocalyptic number.

138285091 is a deficient number, since it is larger than the sum of its proper divisors (19839293).

138285091 is an equidigital number, since it uses as much as digits as its factorization.

138285091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10541.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 138285091 is about 11759.4681427350. The cubic root of 138285091 is about 517.1205380233.

The spelling of 138285091 in words is "one hundred thirty-eight million, two hundred eighty-five thousand, ninety-one".