161204022 has 72 divisors (see below), whose sum is σ = 408836376. Its totient is φ = 45771264.

The previous prime is 161203981. The next prime is 161204027. The reversal of 161204022 is 220402161.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 161203986 and 161204004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161204027) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 169753 + ... + 170699.

It is an arithmetic number, because the mean of its divisors is an integer number (5678283).

Almost surely, 2^161204022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161204022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204418188).

161204022 is an abundant number, since it is smaller than the sum of its proper divisors (247632354).

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

161204022 is a wasteful number, since it uses less digits than its factorization.

161204022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162 (or 1152 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 161204022 is about 12696.6145881491. The cubic root of 161204022 is about 544.2418794431.

Adding to 161204022 its reverse (220402161), we get a palindrome (381606183).

The spelling of 161204022 in words is "one hundred sixty-one million, two hundred four thousand, twenty-two".