161632812 has 48 divisors (see below), whose sum is σ = 420198912. Its totient is φ = 47935680.

The previous prime is 161632777. The next prime is 161632813. The reversal of 161632812 is 218236161.

It is a super-2 number, since 2×161632812² = 52250331830054688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161632812.

It is not an unprimeable number, because it can be changed into a prime (161632813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6823 + ... + 19230.

It is an arithmetic number, because the mean of its divisors is an integer number (8754144).

Almost surely, 2^161632812 is an apocalyptic number.

161632812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161632812 is an abundant number, since it is smaller than the sum of its proper divisors (258566100).

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

161632812 is a wasteful number, since it uses less digits than its factorization.

161632812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26118 (or 26116 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 161632812 is about 12713.4893715298. The cubic root of 161632812 is about 544.7239990713.

Adding to 161632812 its reverse (218236161), we get a palindrome (379868973).

The spelling of 161632812 in words is "one hundred sixty-one million, six hundred thirty-two thousand, eight hundred twelve".