822495257 has 2 divisors, whose sum is σ = 822495258. Its totient is φ = 822495256.

The previous prime is 822495221. The next prime is 822495259. The reversal of 822495257 is 752594228.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 821911561 + 583696 = 28669^2 + 764^2 .

It is a cyclic number.

It is not a de Polignac number, because 822495257 - 2⁸ = 822495001 is a prime.

Together with 822495259, 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 (822495259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411247628 + 411247629.

It is an arithmetic number, because the mean of its divisors is an integer number (411247629).

Almost surely, 2^822495257 is an apocalyptic number.

It is an amenable number.

822495257 is a deficient number, since it is larger than the sum of its proper divisors (1).

822495257 is an equidigital number, since it uses as much as digits as its factorization.

822495257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 44.

The square root of 822495257 is about 28679.1781088650. The cubic root of 822495257 is about 936.9386058068.

The spelling of 822495257 in words is "eight hundred twenty-two million, four hundred ninety-five thousand, two hundred fifty-seven".