222645691 has 2 divisors, whose sum is σ = 222645692. Its totient is φ = 222645690.

The previous prime is 222645679. The next prime is 222645733. The reversal of 222645691 is 196546222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 222645691 - 2⁵ = 222645659 is a prime.

It is a super-2 number, since 2×222645691² = 99142207441734962, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 222645691.

It is not a weakly prime, because it can be changed into another prime (222645601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111322845 + 111322846.

It is an arithmetic number, because the mean of its divisors is an integer number (111322846).

Almost surely, 2^222645691 is an apocalyptic number.

222645691 is a deficient number, since it is larger than the sum of its proper divisors (1).

222645691 is an equidigital number, since it uses as much as digits as its factorization.

222645691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 222645691 is about 14921.3166644234. The cubic root of 222645691 is about 606.0913670616.

The spelling of 222645691 in words is "two hundred twenty-two million, six hundred forty-five thousand, six hundred ninety-one".