222998991 has 8 divisors (see below), whose sum is σ = 312981120. Its totient is φ = 140841432.

The previous prime is 222998983. The next prime is 222999031. The reversal of 222998991 is 199899222.

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

It is not a de Polignac number, because 222998991 - 2³ = 222998983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222998921) 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, 1956075 + ... + 1956188.

It is an arithmetic number, because the mean of its divisors is an integer number (39122640).

Almost surely, 2^222998991 is an apocalyptic number.

222998991 is a deficient number, since it is larger than the sum of its proper divisors (89982129).

222998991 is a wasteful number, since it uses less digits than its factorization.

222998991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912285.

The product of its digits is 419904, while the sum is 51.

The square root of 222998991 is about 14933.1507392111. The cubic root of 222998991 is about 606.4117848448.

The spelling of 222998991 in words is "two hundred twenty-two million, nine hundred ninety-eight thousand, nine hundred ninety-one".