161693532 has 216 divisors, whose sum is σ = 559449072. Its totient is φ = 38707200.

The previous prime is 161693491. The next prime is 161693537. The reversal of 161693532 is 235396161.

161693532 is a `hidden beast` number, since 1 + 61 + 69 + 3 + 532 = 666.

161693532 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 2×161693532² = 52289596581270048, 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 not an unprimeable number, because it can be changed into a prime (161693537) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 251932 + ... + 252572.

It is an arithmetic number, because the mean of its divisors is an integer number (2590042).

Almost surely, 2^161693532 is an apocalyptic number.

161693532 is a gapful number since it is divisible by the number (12) 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 161693532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279724536).

161693532 is an abundant number, since it is smaller than the sum of its proper divisors (397755540).

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

161693532 is a wasteful number, since it uses less digits than its factorization.

161693532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 677 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 161693532 is about 12715.8771620364. The cubic root of 161693532 is about 544.7922020140.

It can be divided in two parts, 16169 and 3532, that added together give a triangular number (19701 = T₁₉₈).

The spelling of 161693532 in words is "one hundred sixty-one million, six hundred ninety-three thousand, five hundred thirty-two".