161633312 has 12 divisors (see below), whose sum is σ = 318215646. Its totient is φ = 80816640.

The previous prime is 161633293. The next prime is 161633317. The reversal of 161633312 is 213336161.

It can be written as a sum of positive squares in only one way, i.e., 129868816 + 31764496 = 11396^2 + 5636^2 .

It is a super-2 number, since 2×161633312² = 52250655096178688, which contains 22 as substring.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (161633317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2525489 + ... + 2525552.

Almost surely, 2^161633312 is an apocalyptic number.

It is an amenable number.

161633312 is a deficient number, since it is larger than the sum of its proper divisors (156582334).

161633312 is an equidigital number, since it uses as much as digits as its factorization.

161633312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5051051 (or 5051043 counting only the distinct ones).

The product of its digits is 1944, while the sum is 26.

The square root of 161633312 is about 12713.5090356675. The cubic root of 161633312 is about 544.7245607594.

Adding to 161633312 its reverse (213336161), we get a palindrome (374969473).

The spelling of 161633312 in words is "one hundred sixty-one million, six hundred thirty-three thousand, three hundred twelve".