222161897 has 4 divisors (see below), whose sum is σ = 222292560. Its totient is φ = 222031236.

The previous prime is 222161869. The next prime is 222161941. The reversal of 222161897 is 798161222.

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, and also an emirpimes, since its reverse is a distinct semiprime: 798161222 = 2 ⋅399080611.

It is a cyclic number.

It is not a de Polignac number, because 222161897 - 2¹² = 222157801 is a prime.

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 222161897.

It is not an unprimeable number, because it can be changed into a prime (222161827) 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 3 ways as a sum of consecutive naturals, for example, 62747 + ... + 66192.

It is an arithmetic number, because the mean of its divisors is an integer number (55573140).

Almost surely, 2^222161897 is an apocalyptic number.

It is an amenable number.

222161897 is a deficient number, since it is larger than the sum of its proper divisors (130663).

222161897 is a wasteful number, since it uses less digits than its factorization.

222161897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130662.

The product of its digits is 24192, while the sum is 38.

The square root of 222161897 is about 14905.0963431975. The cubic root of 222161897 is about 605.6520502153.

The spelling of 222161897 in words is "two hundred twenty-two million, one hundred sixty-one thousand, eight hundred ninety-seven".