2191899049 has 2 divisors, whose sum is σ = 2191899050. Its totient is φ = 2191899048.

The previous prime is 2191899043. The next prime is 2191899053. The reversal of 2191899049 is 9409981912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1307907225 + 883991824 = 36165^2 + 29732^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191899049 - 2³¹ = 44415401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2191898987 and 2191899005.

It is not a weakly prime, because it can be changed into another prime (2191899043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095949524 + 1095949525.

It is an arithmetic number, because the mean of its divisors is an integer number (1095949525).

Almost surely, 2^2191899049 is an apocalyptic number.

It is an amenable number.

2191899049 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191899049 is an equidigital number, since it uses as much as digits as its factorization.

2191899049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 52.

The square root of 2191899049 is about 46817.7215272166. The cubic root of 2191899049 is about 1298.9931156090.

The spelling of 2191899049 in words is "two billion, one hundred ninety-one million, eight hundred ninety-nine thousand, forty-nine".