222997881 has 4 divisors (see below), whose sum is σ = 297330512. Its totient is φ = 148665252.

The previous prime is 222997837. The next prime is 222997979. The reversal of 222997881 is 188799222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 222997881 - 2²³ = 214609273 is a prime.

It is a super-2 number, since 2×222997881² = 99456109860980322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 222997881.

It is not an unprimeable number, because it can be changed into a prime (222997981) 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, 37166311 + ... + 37166316.

It is an arithmetic number, because the mean of its divisors is an integer number (74332628).

Almost surely, 2^222997881 is an apocalyptic number.

It is an amenable number.

222997881 is a deficient number, since it is larger than the sum of its proper divisors (74332631).

222997881 is an equidigital number, since it uses as much as digits as its factorization.

222997881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74332630.

The product of its digits is 290304, while the sum is 48.

The square root of 222997881 is about 14933.1135735318. The cubic root of 222997881 is about 606.4107786845.

The spelling of 222997881 in words is "two hundred twenty-two million, nine hundred ninety-seven thousand, eight hundred eighty-one".