161222700 has 72 divisors (see below), whose sum is σ = 469692160. Its totient is φ = 42696000.

The previous prime is 161222693. The next prime is 161222741. The reversal of 161222700 is 7222161.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43521 + ... + 47079.

Almost surely, 2^161222700 is an apocalyptic number.

161222700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161222700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234846080).

161222700 is an abundant number, since it is smaller than the sum of its proper divisors (308469460).

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

161222700 is a wasteful number, since it uses less digits than its factorization.

161222700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3727 (or 3720 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 161222700 is about 12697.3501172489. The cubic root of 161222700 is about 544.2628982678.

Adding to 161222700 its reverse (7222161), we get a palindrome (168444861).

The spelling of 161222700 in words is "one hundred sixty-one million, two hundred twenty-two thousand, seven hundred".