222117851 has 2 divisors, whose sum is σ = 222117852. Its totient is φ = 222117850.

The previous prime is 222117839. The next prime is 222117853. The reversal of 222117851 is 158711222.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 222117851 - 2¹⁰ = 222116827 is a prime.

Together with 222117853, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_12232757 and since 222117851 and 12232757 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (222117853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111058925 + 111058926.

It is an arithmetic number, because the mean of its divisors is an integer number (111058926).

Almost surely, 2^222117851 is an apocalyptic number.

222117851 is a deficient number, since it is larger than the sum of its proper divisors (1).

222117851 is an equidigital number, since it uses as much as digits as its factorization.

222117851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 29.

The square root of 222117851 is about 14903.6187216394. The cubic root of 222117851 is about 605.6120218790.

The spelling of 222117851 in words is "two hundred twenty-two million, one hundred seventeen thousand, eight hundred fifty-one".