161603104 has 48 divisors (see below), whose sum is σ = 343768320. Its totient is φ = 74338560.

The previous prime is 161603081. The next prime is 161603107. The reversal of 161603104 is 401306161.

It is a happy number.

It is a super-2 number, since 2×161603104² = 52231126444869632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161603107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198859 + ... + 199669.

It is an arithmetic number, because the mean of its divisors is an integer number (7161840).

Almost surely, 2^161603104 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 161603104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171884160).

161603104 is an abundant number, since it is smaller than the sum of its proper divisors (182165216).

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

161603104 is a wasteful number, since it uses less digits than its factorization.

161603104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313 (or 1305 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 161603104 is about 12712.3209525248. The cubic root of 161603104 is about 544.6906237272.

Adding to 161603104 its reverse (401306161), we get a palindrome (562909265).

The spelling of 161603104 in words is "one hundred sixty-one million, six hundred three thousand, one hundred four".