2197171849 has 2 divisors, whose sum is σ = 2197171850. Its totient is φ = 2197171848.

The previous prime is 2197171831. The next prime is 2197171883. The reversal of 2197171849 is 9481717912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1177519225 + 1019652624 = 34315^2 + 31932^2 .

It is a cyclic number.

It is not a de Polignac number, because 2197171849 - 2³¹ = 49688201 is a prime.

It is not a weakly prime, because it can be changed into another prime (2197171819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1098585924 + 1098585925.

It is an arithmetic number, because the mean of its divisors is an integer number (1098585925).

Almost surely, 2^2197171849 is an apocalyptic number.

It is an amenable number.

2197171849 is a deficient number, since it is larger than the sum of its proper divisors (1).

2197171849 is an equidigital number, since it uses as much as digits as its factorization.

2197171849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 49.

The square root of 2197171849 is about 46873.9997119939. Note that the first 3 decimals coincide. The cubic root of 2197171849 is about 1300.0338943825.

The spelling of 2197171849 in words is "two billion, one hundred ninety-seven million, one hundred seventy-one thousand, eight hundred forty-nine".