222506581 has 8 divisors (see below), whose sum is σ = 245808000. Its totient is φ = 199717440.

The previous prime is 222506569. The next prime is 222506593. The reversal of 222506581 is 185605222.

222506581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (222506569) and next prime (222506593).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 222506581 - 2¹⁵ = 222473813 is a prime.

It is a super-2 number, since 2×222506581² = 99018357176619122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222506281) 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, 127156 + ... + 128893.

It is an arithmetic number, because the mean of its divisors is an integer number (30726000).

Almost surely, 2^222506581 is an apocalyptic number.

It is an amenable number.

222506581 is a deficient number, since it is larger than the sum of its proper divisors (23301419).

222506581 is a wasteful number, since it uses less digits than its factorization.

222506581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256139.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 222506581 is about 14916.6544841663. The cubic root of 222506581 is about 605.9651112519.

The spelling of 222506581 in words is "two hundred twenty-two million, five hundred six thousand, five hundred eighty-one".