138915403593121 has 4 divisors (see below), whose sum is σ = 143396545644544. Its totient is φ = 134434261541700.

The previous prime is 138915403593053. The next prime is 138915403593137. The reversal of 138915403593121 is 121395304519831.

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.

It is a cyclic number.

It is not a de Polignac number, because 138915403593121 - 2³⁷ = 138777964639649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138915403593821) 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, 2240571025665 + ... + 2240571025726.

It is an arithmetic number, because the mean of its divisors is an integer number (35849136411136).

Almost surely, 2^{138915403593121} is an apocalyptic number.

It is an amenable number.

138915403593121 is a deficient number, since it is larger than the sum of its proper divisors (4481142051423).

138915403593121 is an equidigital number, since it uses as much as digits as its factorization.

138915403593121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4481142051422.

The product of its (nonzero) digits is 3499200, while the sum is 55.

The spelling of 138915403593121 in words is "one hundred thirty-eight trillion, nine hundred fifteen billion, four hundred three million, five hundred ninety-three thousand, one hundred twenty-one".