2149878193 has 2 divisors, whose sum is σ = 2149878194. Its totient is φ = 2149878192.

The previous prime is 2149878079. The next prime is 2149878217. The reversal of 2149878193 is 3918789412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2058618384 + 91259809 = 45372^2 + 9553^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2149878193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2149878193.

It is not a weakly prime, because it can be changed into another prime (2149878893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1074939096 + 1074939097.

It is an arithmetic number, because the mean of its divisors is an integer number (1074939097).

Almost surely, 2^2149878193 is an apocalyptic number.

It is an amenable number.

2149878193 is a deficient number, since it is larger than the sum of its proper divisors (1).

2149878193 is an equidigital number, since it uses as much as digits as its factorization.

2149878193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 52.

The square root of 2149878193 is about 46366.7789802138. The cubic root of 2149878193 is about 1290.6385062953.

The spelling of 2149878193 in words is "two billion, one hundred forty-nine million, eight hundred seventy-eight thousand, one hundred ninety-three".