222191399 has 4 divisors (see below), whose sum is σ = 222221664. Its totient is φ = 222161136.

The previous prime is 222191393. The next prime is 222191407. The reversal of 222191399 is 993191222.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222191399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222191393) 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, 3659 + ... + 21395.

It is an arithmetic number, because the mean of its divisors is an integer number (55555416).

Almost surely, 2^222191399 is an apocalyptic number.

222191399 is a deficient number, since it is larger than the sum of its proper divisors (30265).

222191399 is a wasteful number, since it uses less digits than its factorization.

222191399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30264.

The product of its digits is 17496, while the sum is 38.

The square root of 222191399 is about 14906.0859718438. The cubic root of 222191399 is about 605.6788582266.

The spelling of 222191399 in words is "two hundred twenty-two million, one hundred ninety-one thousand, three hundred ninety-nine".