222161500 has 96 divisors (see below), whose sum is σ = 546803712. Its totient is φ = 78120000.

The previous prime is 222161497. The next prime is 222161501. The reversal of 222161500 is 5161222.

222161500 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222161501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 169849 + ... + 171151.

It is an arithmetic number, because the mean of its divisors is an integer number (5695872).

Almost surely, 2^222161500 is an apocalyptic number.

222161500 is a gapful number since it is divisible by the number (20) 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 222161500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273401856).

222161500 is an abundant number, since it is smaller than the sum of its proper divisors (324642212).

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

222161500 is a wasteful number, since it uses less digits than its factorization.

222161500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364 (or 1352 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 222161500 is about 14905.0830255990. The cubic root of 222161500 is about 605.6516894513.

It can be divided in two parts, 22216 and 1500, that added together give a square (23716 = 154²).

The spelling of 222161500 in words is "two hundred twenty-two million, one hundred sixty-one thousand, five hundred".