2291819897 has 2 divisors, whose sum is σ = 2291819898. Its totient is φ = 2291819896.

The previous prime is 2291819879. The next prime is 2291819899. The reversal of 2291819897 is 7989181922.

Together with previous prime (2291819879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2004890176 + 286929721 = 44776^2 + 16939^2 .

It is a cyclic number.

It is not a de Polignac number, because 2291819897 - 2²⁴ = 2275042681 is a prime.

Together with 2291819899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2291819899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1145909948 + 1145909949.

It is an arithmetic number, because the mean of its divisors is an integer number (1145909949).

Almost surely, 2^2291819897 is an apocalyptic number.

It is an amenable number.

2291819897 is a deficient number, since it is larger than the sum of its proper divisors (1).

2291819897 is an equidigital number, since it uses as much as digits as its factorization.

2291819897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 56.

The square root of 2291819897 is about 47872.9557996997. The cubic root of 2291819897 is about 1318.4393663749.

The spelling of 2291819897 in words is "two billion, two hundred ninety-one million, eight hundred nineteen thousand, eight hundred ninety-seven".