161261113 has 16 divisors (see below), whose sum is σ = 183668800. Its totient is φ = 140356800.

The previous prime is 161261069. The next prime is 161261129. The reversal of 161261113 is 311162161.

161261113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-161261113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161261143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55138 + ... + 57988.

It is an arithmetic number, because the mean of its divisors is an integer number (11479300).

Almost surely, 2^161261113 is an apocalyptic number.

161261113 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

161261113 is a deficient number, since it is larger than the sum of its proper divisors (22407687).

161261113 is a wasteful number, since it uses less digits than its factorization.

161261113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3112.

The product of its digits is 216, while the sum is 22.

The square root of 161261113 is about 12698.8626656091. The cubic root of 161261113 is about 544.3061202841.

It can be divided in two parts, 16 and 1261113, that added together give a square (1261129 = 1123²).

The spelling of 161261113 in words is "one hundred sixty-one million, two hundred sixty-one thousand, one hundred thirteen".