222155999 has 16 divisors (see below), whose sum is σ = 257990880. Its totient is φ = 189527040.

The previous prime is 222155971. The next prime is 222156023. The reversal of 222155999 is 999551222.

222155999 = 361² + 362² + ... + 893².

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222155999 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 (222155909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 842 + ... + 21095.

It is an arithmetic number, because the mean of its divisors is an integer number (16124430).

Almost surely, 2^222155999 is an apocalyptic number.

222155999 is a deficient number, since it is larger than the sum of its proper divisors (35834881).

222155999 is a wasteful number, since it uses less digits than its factorization.

222155999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22010.

The product of its digits is 145800, while the sum is 44.

The square root of 222155999 is about 14904.8984900938. The cubic root of 222155999 is about 605.6466905092.

The spelling of 222155999 in words is "two hundred twenty-two million, one hundred fifty-five thousand, nine hundred ninety-nine".