2191826457259 has 2 divisors, whose sum is σ = 2191826457260. Its totient is φ = 2191826457258.

The previous prime is 2191826457187. The next prime is 2191826457311. The reversal of 2191826457259 is 9527546281912.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2191826457259 - 2¹⁷ = 2191826326187 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2191826457197 and 2191826457206.

It is not a weakly prime, because it can be changed into another prime (2191826457659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095913228629 + 1095913228630.

It is an arithmetic number, because the mean of its divisors is an integer number (1095913228630).

Almost surely, 2^{2191826457259} is an apocalyptic number.

2191826457259 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191826457259 is an equidigital number, since it uses as much as digits as its factorization.

2191826457259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21772800, while the sum is 61.

The spelling of 2191826457259 in words is "two trillion, one hundred ninety-one billion, eight hundred twenty-six million, four hundred fifty-seven thousand, two hundred fifty-nine".