161684532 has 48 divisors (see below), whose sum is σ = 420609280. Its totient is φ = 53711424.

The previous prime is 161684527. The next prime is 161684573. The reversal of 161684532 is 235486161.

It is a happy number.

161684532 is a `hidden beast` number, since 1 + 61 + 68 + 4 + 532 = 666.

It is a super-2 number, since 2×161684532² = 52283775776118048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31413 + ... + 36195.

Almost surely, 2^161684532 is an apocalyptic number.

161684532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161684532 is an abundant number, since it is smaller than the sum of its proper divisors (258924748).

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

161684532 is a wasteful number, since it uses less digits than its factorization.

161684532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5109 (or 5101 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 161684532 is about 12715.5232688238. The cubic root of 161684532 is about 544.7820939602.

The spelling of 161684532 in words is "one hundred sixty-one million, six hundred eighty-four thousand, five hundred thirty-two".