138768161 has 32 divisors (see below), whose sum is σ = 176256000. Its totient is φ = 106509312.

The previous prime is 138768101. The next prime is 138768173. The reversal of 138768161 is 161867831.

It is not a de Polignac number, because 138768161 - 2²⁶ = 71659297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138768101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 272375 + ... + 272883.

It is an arithmetic number, because the mean of its divisors is an integer number (5508000).

Almost surely, 2^138768161 is an apocalyptic number.

It is an amenable number.

138768161 is a deficient number, since it is larger than the sum of its proper divisors (37487839).

138768161 is a wasteful number, since it uses less digits than its factorization.

138768161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641.

The product of its digits is 48384, while the sum is 41.

The square root of 138768161 is about 11779.9898556832. The cubic root of 138768161 is about 517.7219889793.

The spelling of 138768161 in words is "one hundred thirty-eight million, seven hundred sixty-eight thousand, one hundred sixty-one".