161516232 has 24 divisors (see below), whose sum is σ = 437439990. Its totient is φ = 53838720.

The previous prime is 161516203. The next prime is 161516233. The reversal of 161516232 is 232615161.

161516232 is a `hidden beast` number, since 1 + 615 + 16 + 2 + 32 = 666.

It can be written as a sum of positive squares in only one way, i.e., 158911236 + 2604996 = 12606^2 + 1614^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 161516196 and 161516205.

It is not an unprimeable number, because it can be changed into a prime (161516233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1121569 + ... + 1121712.

Almost surely, 2^161516232 is an apocalyptic number.

161516232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161516232 is an abundant number, since it is smaller than the sum of its proper divisors (275923758).

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

161516232 is a wasteful number, since it uses less digits than its factorization.

161516232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2243293 (or 2243286 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 161516232 is about 12708.9036505908. The cubic root of 161516232 is about 544.5930042218.

The spelling of 161516232 in words is "one hundred sixty-one million, five hundred sixteen thousand, two hundred thirty-two".