138417161 has 4 divisors (see below), whose sum is σ = 139972500. Its totient is φ = 136861824.

The previous prime is 138417143. The next prime is 138417187. The reversal of 138417161 is 161714831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161714831 = 211 ⋅766421.

It can be written as a sum of positive squares in 2 ways, for example, as 26988025 + 111429136 = 5195^2 + 10556^2 .

It is a cyclic number.

It is not a de Polignac number, because 138417161 - 2¹⁴ = 138400777 is a prime.

It is a super-3 number, since 3×138417161³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138417101) 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, 777536 + ... + 777713.

It is an arithmetic number, because the mean of its divisors is an integer number (34993125).

Almost surely, 2^138417161 is an apocalyptic number.

It is an amenable number.

138417161 is a deficient number, since it is larger than the sum of its proper divisors (1555339).

138417161 is an equidigital number, since it uses as much as digits as its factorization.

138417161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555338.

The product of its digits is 4032, while the sum is 32.

The square root of 138417161 is about 11765.0822776554. The cubic root of 138417161 is about 517.2851119922.

The spelling of 138417161 in words is "one hundred thirty-eight million, four hundred seventeen thousand, one hundred sixty-one".