161930090 has 32 divisors (see below), whose sum is σ = 333624960. Its totient is φ = 55433664.

The previous prime is 161930077. The next prime is 161930099. The reversal of 161930090 is 90039161.

It is not an unprimeable number, because it can be changed into a prime (161930099) 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, 58784 + ... + 61476.

It is an arithmetic number, because the mean of its divisors is an integer number (10425780).

Almost surely, 2^161930090 is an apocalyptic number.

161930090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161930090 is an abundant number, since it is smaller than the sum of its proper divisors (171694870).

161930090 is a wasteful number, since it uses less digits than its factorization.

161930090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3566.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 161930090 is about 12725.1754408338. The cubic root of 161930090 is about 545.0577499615.

The spelling of 161930090 in words is "one hundred sixty-one million, nine hundred thirty thousand, ninety".