2194663729 has 2 divisors, whose sum is σ = 2194663730. Its totient is φ = 2194663728.

The previous prime is 2194663619. The next prime is 2194663771. The reversal of 2194663729 is 9273664912.

2194663729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2019154225 + 175509504 = 44935^2 + 13248^2 .

It is a cyclic number.

It is not a de Polignac number, because 2194663729 - 2⁹ = 2194663217 is a prime.

It is not a weakly prime, because it can be changed into another prime (2194663789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097331864 + 1097331865.

It is an arithmetic number, because the mean of its divisors is an integer number (1097331865).

Almost surely, 2^2194663729 is an apocalyptic number.

It is an amenable number.

2194663729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2194663729 is an equidigital number, since it uses as much as digits as its factorization.

2194663729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 49.

The square root of 2194663729 is about 46847.2382216924. The cubic root of 2194663729 is about 1299.5390336069.

The spelling of 2194663729 in words is "two billion, one hundred ninety-four million, six hundred sixty-three thousand, seven hundred twenty-nine".