222100009 has 4 divisors (see below), whose sum is σ = 229758660. Its totient is φ = 214441360.

The previous prime is 222099991. The next prime is 222100037. The reversal of 222100009 is 900001222.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 134490409 + 87609600 = 11597^2 + 9360^2 .

It is a cyclic number.

It is not a de Polignac number, because 222100009 - 2⁹ = 222099497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222099965 and 222100001.

It is not an unprimeable number, because it can be changed into a prime (222100049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3829282 + ... + 3829339.

It is an arithmetic number, because the mean of its divisors is an integer number (57439665).

Almost surely, 2^222100009 is an apocalyptic number.

222100009 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

222100009 is a deficient number, since it is larger than the sum of its proper divisors (7658651).

222100009 is an equidigital number, since it uses as much as digits as its factorization.

222100009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7658650.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 222100009 is about 14903.0201301615. The cubic root of 222100009 is about 605.5958058343.

The spelling of 222100009 in words is "two hundred twenty-two million, one hundred thousand, nine".