222161905 has 8 divisors (see below), whose sum is σ = 304679232. Its totient is φ = 152339568.

The previous prime is 222161869. The next prime is 222161941. The reversal of 222161905 is 509161222.

It is an interprime number because it is at equal distance from previous prime (222161869) and next prime (222161941).

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

It is a cyclic number.

It is not a de Polignac number, because 222161905 - 2⁷ = 222161777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3173707 + ... + 3173776.

It is an arithmetic number, because the mean of its divisors is an integer number (38084904).

Almost surely, 2^222161905 is an apocalyptic number.

It is an amenable number.

222161905 is a deficient number, since it is larger than the sum of its proper divisors (82517327).

222161905 is an equidigital number, since it uses as much as digits as its factorization.

222161905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6347495.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 222161905 is about 14905.0966115621. The cubic root of 222161905 is about 605.6520574851.

The spelling of 222161905 in words is "two hundred twenty-two million, one hundred sixty-one thousand, nine hundred five".