997000000823 has 2 divisors, whose sum is σ = 997000000824. Its totient is φ = 997000000822.

The previous prime is 997000000793. The next prime is 997000000847. The reversal of 997000000823 is 328000000799.

997000000823 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (328000000799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997000000823 - 2⁸ = 997000000567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997000000873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498500000411 + 498500000412.

It is an arithmetic number, because the mean of its divisors is an integer number (498500000412).

Almost surely, 2^997000000823 is an apocalyptic number.

997000000823 is a deficient number, since it is larger than the sum of its proper divisors (1).

997000000823 is an equidigital number, since it uses as much as digits as its factorization.

997000000823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The spelling of 997000000823 in words is "nine hundred ninety-seven billion, eight hundred twenty-three", and thus it is an aban number.