161691260 has 24 divisors (see below), whose sum is σ = 339828720. Its totient is φ = 64623744.

The previous prime is 161691251. The next prime is 161691307. The reversal of 161691260 is 62196161.

It is a super-2 number, since 2×161691260² = 52288127120775200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30056 + ... + 35024.

It is an arithmetic number, because the mean of its divisors is an integer number (14159530).

Almost surely, 2^161691260 is an apocalyptic number.

161691260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161691260 is an abundant number, since it is smaller than the sum of its proper divisors (178137460).

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

161691260 is a wasteful number, since it uses less digits than its factorization.

161691260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6605 (or 6603 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 161691260 is about 12715.7878245903. The cubic root of 161691260 is about 544.7896503274.

The spelling of 161691260 in words is "one hundred sixty-one million, six hundred ninety-one thousand, two hundred sixty".