161105236 has 24 divisors (see below), whose sum is σ = 290696616. Its totient is φ = 78074880.

The previous prime is 161105227. The next prime is 161105239. The reversal of 161105236 is 632501161.

It can be written as a sum of positive squares in 4 ways, for example, as 18541636 + 142563600 = 4306^2 + 11940^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 161105236.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161105239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22620 + ... + 28876.

It is an arithmetic number, because the mean of its divisors is an integer number (12112359).

Almost surely, 2^161105236 is an apocalyptic number.

It is an amenable number.

161105236 is a deficient number, since it is larger than the sum of its proper divisors (129591380).

161105236 is a wasteful number, since it uses less digits than its factorization.

161105236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6459 (or 6457 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 161105236 is about 12692.7237423652. The cubic root of 161105236 is about 544.1306860550.

Adding to 161105236 its reverse (632501161), we get a palindrome (793606397).

The spelling of 161105236 in words is "one hundred sixty-one million, one hundred five thousand, two hundred thirty-six".