161201312 has 24 divisors (see below), whose sum is σ = 319504500. Its totient is φ = 80057344.

The previous prime is 161201297. The next prime is 161201347. The reversal of 161201312 is 213102161.

161201312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 155650576 + 5550736 = 12476^2 + 2356^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12137 + ... + 21672.

Almost surely, 2^161201312 is an apocalyptic number.

It is an amenable number.

161201312 is a deficient number, since it is larger than the sum of its proper divisors (158303188).

161201312 is a wasteful number, since it uses less digits than its factorization.

161201312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33968 (or 33960 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 161201312 is about 12696.5078663387. The cubic root of 161201312 is about 544.2388296768.

Adding to 161201312 its reverse (213102161), we get a palindrome (374303473).

The spelling of 161201312 in words is "one hundred sixty-one million, two hundred one thousand, three hundred twelve".