822991487 has 2 divisors, whose sum is σ = 822991488. Its totient is φ = 822991486.

The previous prime is 822991447. The next prime is 822991489. The reversal of 822991487 is 784199228.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 822991487 - 2¹⁰ = 822990463 is a prime.

Together with 822991489, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (822991489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411495743 + 411495744.

It is an arithmetic number, because the mean of its divisors is an integer number (411495744).

Almost surely, 2^822991487 is an apocalyptic number.

822991487 is a deficient number, since it is larger than the sum of its proper divisors (1).

822991487 is an equidigital number, since it uses as much as digits as its factorization.

822991487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 50.

The square root of 822991487 is about 28687.8282029156. The cubic root of 822991487 is about 937.1269933464.

The spelling of 822991487 in words is "eight hundred twenty-two million, nine hundred ninety-one thousand, four hundred eighty-seven".