161809450 has 24 divisors (see below), whose sum is σ = 328327200. Its totient is φ = 58839600.

The previous prime is 161809433. The next prime is 161809471. The reversal of 161809450 is 54908161.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146550 + ... + 147649.

It is an arithmetic number, because the mean of its divisors is an integer number (13680300).

Almost surely, 2^161809450 is an apocalyptic number.

161809450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161809450 is an abundant number, since it is smaller than the sum of its proper divisors (166517750).

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

161809450 is a wasteful number, since it uses less digits than its factorization.

161809450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294222 (or 294217 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 161809450 is about 12720.4343479301. The cubic root of 161809450 is about 544.9223579881.

The spelling of 161809450 in words is "one hundred sixty-one million, eight hundred nine thousand, four hundred fifty".