222215131609 has 9 divisors (see below), whose sum is σ = 222868042173. Its totient is φ = 221564132352.

The previous prime is 222215131601. The next prime is 222215131673. The reversal of 222215131609 is 906131512222.

The square root of 222215131609 is 471397.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 122755633225 + 99459498384 = 350365^2 + 315372^2 .

It is not a de Polignac number, because 222215131609 - 2³ = 222215131601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222215131601) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 288965977 + ... + 288966745.

It is an arithmetic number, because the mean of its divisors is an integer number (24763115797).

Almost surely, 2^222215131609 is an apocalyptic number.

222215131609 is the 471397-th square number.

222215131609 is the 235699-th centered octagonal number.

It is an amenable number.

222215131609 is a deficient number, since it is larger than the sum of its proper divisors (652910564).

222215131609 is an frugal number, since it uses more digits than its factorization.

222215131609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2764 (or 1382 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 222215131609 in words is "two hundred twenty-two billion, two hundred fifteen million, one hundred thirty-one thousand, six hundred nine".