2198219861 has 2 divisors, whose sum is σ = 2198219862. Its totient is φ = 2198219860.

The previous prime is 2198219857. The next prime is 2198219893. The reversal of 2198219861 is 1689128912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1465434961 + 732784900 = 38281^2 + 27070^2 .

It is a cyclic number.

It is not a de Polignac number, because 2198219861 - 2² = 2198219857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2198219761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1099109930 + 1099109931.

It is an arithmetic number, because the mean of its divisors is an integer number (1099109931).

Almost surely, 2^2198219861 is an apocalyptic number.

It is an amenable number.

2198219861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2198219861 is an equidigital number, since it uses as much as digits as its factorization.

2198219861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 47.

The square root of 2198219861 is about 46885.1774124829. The cubic root of 2198219861 is about 1300.2405592304.

The spelling of 2198219861 in words is "two billion, one hundred ninety-eight million, two hundred nineteen thousand, eight hundred sixty-one".