161542236 has 48 divisors (see below), whose sum is σ = 388080000. Its totient is φ = 52277952.

The previous prime is 161542231. The next prime is 161542247. The reversal of 161542236 is 632245161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161542231) 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, 57390 + ... + 60138.

It is an arithmetic number, because the mean of its divisors is an integer number (8085000).

Almost surely, 2^161542236 is an apocalyptic number.

It is an amenable number.

161542236 is an abundant number, since it is smaller than the sum of its proper divisors (226537764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161542236 is a wasteful number, since it uses less digits than its factorization.

161542236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2898 (or 2896 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 161542236 is about 12709.9266717004. The cubic root of 161542236 is about 544.6222290173.

Adding to 161542236 its reverse (632245161), we get a palindrome (793787397).

The spelling of 161542236 in words is "one hundred sixty-one million, five hundred forty-two thousand, two hundred thirty-six".