123297791 has 2 divisors, whose sum is σ = 123297792. Its totient is φ = 123297790.

The previous prime is 123297781. The next prime is 123297793. The reversal of 123297791 is 197792321.

It is a strong prime.

It is an emirp because it is prime and its reverse (197792321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123297791 is a prime.

Together with 123297793, 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 (123297793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61648895 + 61648896.

It is an arithmetic number, because the mean of its divisors is an integer number (61648896).

Almost surely, 2^123297791 is an apocalyptic number.

123297791 is a deficient number, since it is larger than the sum of its proper divisors (1).

123297791 is an equidigital number, since it uses as much as digits as its factorization.

123297791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47628, while the sum is 41.

The square root of 123297791 is about 11103.9538453652. The cubic root of 123297791 is about 497.7200070674.

The spelling of 123297791 in words is "one hundred twenty-three million, two hundred ninety-seven thousand, seven hundred ninety-one".