222319987 has 4 divisors (see below), whose sum is σ = 223205976. Its totient is φ = 221434000.

The previous prime is 222319973. The next prime is 222320009. The reversal of 222319987 is 789913222.

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

It is a cyclic number.

It is not a de Polignac number, because 222319987 - 2⁷ = 222319859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222319927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442618 + ... + 443119.

It is an arithmetic number, because the mean of its divisors is an integer number (55801494).

Almost surely, 2^222319987 is an apocalyptic number.

222319987 is a deficient number, since it is larger than the sum of its proper divisors (885989).

222319987 is an equidigital number, since it uses as much as digits as its factorization.

222319987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885988.

The product of its digits is 108864, while the sum is 43.

The square root of 222319987 is about 14910.3986197553. The cubic root of 222319987 is about 605.7956764501.

The spelling of 222319987 in words is "two hundred twenty-two million, three hundred nineteen thousand, nine hundred eighty-seven".