161239104 has 168 divisors, whose sum is σ = 507306072. Its totient is φ = 48660480.

The previous prime is 161239103. The next prime is 161239139. The reversal of 161239104 is 401932161.

161239104 is a `hidden beast` number, since 1 + 612 + 39 + 10 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3686400 + 157552704 = 1920^2 + 12552^2 .

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 not an unprimeable number, because it can be changed into a prime (161239103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 456592 + ... + 456944.

It is an arithmetic number, because the mean of its divisors is an integer number (3019679).

Almost surely, 2^161239104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161239104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253653036).

161239104 is an abundant number, since it is smaller than the sum of its proper divisors (346066968).

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

161239104 is a wasteful number, since it uses less digits than its factorization.

161239104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 161239104 is about 12697.9960623714. The cubic root of 161239104 is about 544.2813567640.

The spelling of 161239104 in words is "one hundred sixty-one million, two hundred thirty-nine thousand, one hundred four".