161090500 has 48 divisors (see below), whose sum is σ = 353808000. Its totient is φ = 64072800.

The previous prime is 161090497. The next prime is 161090509. The reversal of 161090500 is 5090161.

It is not an unprimeable number, because it can be changed into a prime (161090509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98691 + ... + 100309.

It is an arithmetic number, because the mean of its divisors is an integer number (7371000).

Almost surely, 2^161090500 is an apocalyptic number.

161090500 is a gapful number since it is divisible by the number (10) 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 161090500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176904000).

161090500 is an abundant number, since it is smaller than the sum of its proper divisors (192717500).

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

161090500 is a wasteful number, since it uses less digits than its factorization.

161090500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837 (or 1825 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 161090500 is about 12692.1432390278. The cubic root of 161090500 is about 544.1140953377.

The spelling of 161090500 in words is "one hundred sixty-one million, ninety thousand, five hundred".