161898912 has 120 divisors (see below), whose sum is σ = 544221216. Its totient is φ = 46251648.

The previous prime is 161898911. The next prime is 161898929. The reversal of 161898912 is 219898161.

It is a super-2 number, since 2×161898912² = 52422515413567488, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (161898911) 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 19 ways as a sum of consecutive naturals, for example, 13683 + ... + 22605.

Almost surely, 2^161898912 is an apocalyptic number.

161898912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161898912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272110608).

161898912 is an abundant number, since it is smaller than the sum of its proper divisors (382322304).

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

161898912 is an equidigital number, since it uses as much as digits as its factorization.

161898912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8952 (or 8935 counting only the distinct ones).

The product of its digits is 62208, while the sum is 45.

The square root of 161898912 is about 12723.9503299879. The cubic root of 161898912 is about 545.0227659317.

The spelling of 161898912 in words is "one hundred sixty-one million, eight hundred ninety-eight thousand, nine hundred twelve".