2278198217 has 2 divisors, whose sum is σ = 2278198218. Its totient is φ = 2278198216.

The previous prime is 2278198213. The next prime is 2278198259. The reversal of 2278198217 is 7128918722.

2278198217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2235020176 + 43178041 = 47276^2 + 6571^2 .

It is a cyclic number.

It is not a de Polignac number, because 2278198217 - 2² = 2278198213 is a prime.

It is not a weakly prime, because it can be changed into another prime (2278198213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1139099108 + 1139099109.

It is an arithmetic number, because the mean of its divisors is an integer number (1139099109).

Almost surely, 2^2278198217 is an apocalyptic number.

It is an amenable number.

2278198217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2278198217 is an equidigital number, since it uses as much as digits as its factorization.

2278198217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 47.

The square root of 2278198217 is about 47730.4747200360. The cubic root of 2278198217 is about 1315.8220783613.

The spelling of 2278198217 in words is "two billion, two hundred seventy-eight million, one hundred ninety-eight thousand, two hundred seventeen".