161685230 has 16 divisors (see below), whose sum is σ = 332609760. Its totient is φ = 55434912.

The previous prime is 161685211. The next prime is 161685233. The reversal of 161685230 is 32586161.

It is a happy number.

161685230 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161685230² = 52284227200305800, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161685233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1154825 + ... + 1154964.

It is an arithmetic number, because the mean of its divisors is an integer number (20788110).

Almost surely, 2^161685230 is an apocalyptic number.

161685230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161685230 is an abundant number, since it is smaller than the sum of its proper divisors (170924530).

161685230 is a wasteful number, since it uses less digits than its factorization.

161685230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2309803.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 161685230 is about 12715.5507155608. The cubic root of 161685230 is about 544.7828779093.

The spelling of 161685230 in words is "one hundred sixty-one million, six hundred eighty-five thousand, two hundred thirty".