161338113 has 6 divisors (see below), whose sum is σ = 233043954. Its totient is φ = 107558736.

The previous prime is 161338069. The next prime is 161338147. The reversal of 161338113 is 311833161.

161338113 is a `hidden beast` number, since 1 + 613 + 38 + 1 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 110187009 + 51151104 = 10497^2 + 7152^2 .

It is not a de Polignac number, because 161338113 - 2²⁰ = 160289537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161338153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8963220 + ... + 8963237.

It is an arithmetic number, because the mean of its divisors is an integer number (38840659).

Almost surely, 2^161338113 is an apocalyptic number.

It is an amenable number.

161338113 is a deficient number, since it is larger than the sum of its proper divisors (71705841).

161338113 is a wasteful number, since it uses less digits than its factorization.

161338113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17926463 (or 17926460 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 161338113 is about 12701.8940713580. The cubic root of 161338113 is about 544.3927394355.

The spelling of 161338113 in words is "one hundred sixty-one million, three hundred thirty-eight thousand, one hundred thirteen".