2191038049 has 2 divisors, whose sum is σ = 2191038050. Its totient is φ = 2191038048.

The previous prime is 2191038023. The next prime is 2191038169. The reversal of 2191038049 is 9408301912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2136750625 + 54287424 = 46225^2 + 7368^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191038049 - 2⁷ = 2191037921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2191037999 and 2191038017.

It is not a weakly prime, because it can be changed into another prime (2191038449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095519024 + 1095519025.

It is an arithmetic number, because the mean of its divisors is an integer number (1095519025).

Almost surely, 2^2191038049 is an apocalyptic number.

It is an amenable number.

2191038049 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191038049 is an equidigital number, since it uses as much as digits as its factorization.

2191038049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 2191038049 is about 46808.5253880102. The cubic root of 2191038049 is about 1298.8230074785.

The spelling of 2191038049 in words is "two billion, one hundred ninety-one million, thirty-eight thousand, forty-nine".