2197138859 has 2 divisors, whose sum is σ = 2197138860. Its totient is φ = 2197138858.

The previous prime is 2197138849. The next prime is 2197138883. The reversal of 2197138859 is 9588317912.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2197138859 - 2⁴ = 2197138843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2197138859.

It is not a weakly prime, because it can be changed into another prime (2197138829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1098569429 + 1098569430.

It is an arithmetic number, because the mean of its divisors is an integer number (1098569430).

Almost surely, 2^2197138859 is an apocalyptic number.

2197138859 is a deficient number, since it is larger than the sum of its proper divisors (1).

2197138859 is an equidigital number, since it uses as much as digits as its factorization.

2197138859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 53.

The square root of 2197138859 is about 46873.6478098302. The cubic root of 2197138859 is about 1300.0273877859.

The spelling of 2197138859 in words is "two billion, one hundred ninety-seven million, one hundred thirty-eight thousand, eight hundred fifty-nine".