161584992 has 36 divisors (see below), whose sum is σ = 459508140. Its totient is φ = 53861568.

The previous prime is 161584967. The next prime is 161584993. The reversal of 161584992 is 299485161.

161584992 is a `hidden beast` number, since 1 + 6 + 158 + 499 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×161584992² = 52219419279280128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161584993) 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, 280242 + ... + 280817.

It is an arithmetic number, because the mean of its divisors is an integer number (12764115).

Almost surely, 2^161584992 is an apocalyptic number.

161584992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161584992 is an abundant number, since it is smaller than the sum of its proper divisors (297923148).

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

161584992 is a wasteful number, since it uses less digits than its factorization.

161584992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561075 (or 561064 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 161584992 is about 12711.6085528150. The cubic root of 161584992 is about 544.6702738599.

The spelling of 161584992 in words is "one hundred sixty-one million, five hundred eighty-four thousand, nine hundred ninety-two".