161900 has 18 divisors (see below), whose sum is σ = 351540. Its totient is φ = 64720.

The previous prime is 161881. The next prime is 161911. The reversal of 161900 is 9161.

161900 is nontrivially palindromic in base 3.

161900 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161900² = 52423220000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 710 + ... + 909.

It is an arithmetic number, because the mean of its divisors is an integer number (19530).

2¹⁶¹⁹⁰⁰ is an apocalyptic number.

161900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161900 is an abundant number, since it is smaller than the sum of its proper divisors (189640).

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

161900 is a wasteful number, since it uses less digits than its factorization.

161900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633 (or 1626 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 161900 is about 402.3679907746. The cubic root of 161900 is about 54.5023986824.

The spelling of 161900 in words is "one hundred sixty-one thousand, nine hundred".