138481481161 has 3 divisors (see below), whose sum is σ = 138481853293. Its totient is φ = 138481109030.

The previous prime is 138481481153. The next prime is 138481481167. The reversal of 138481481161 is 161184184831.

The square root of 138481481161 is 372131.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 138481481161 - 2³ = 138481481153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138481481167) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 186066 + ... + 558196.

Almost surely, 2^138481481161 is an apocalyptic number.

138481481161 is the 372131-st square number.

138481481161 is the 186066-th centered octagonal number.

It is an amenable number.

138481481161 is a deficient number, since it is larger than the sum of its proper divisors (372132).

138481481161 is an frugal number, since it uses more digits than its factorization.

138481481161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744262 (or 372131 counting only the distinct ones).

The product of its digits is 147456, while the sum is 46.

The spelling of 138481481161 in words is "one hundred thirty-eight billion, four hundred eighty-one million, four hundred eighty-one thousand, one hundred sixty-one".