123320987 has 2 divisors, whose sum is σ = 123320988. Its totient is φ = 123320986.

The previous prime is 123320971. The next prime is 123320999. The reversal of 123320987 is 789023321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123320987 - 2⁴ = 123320971 is a prime.

It is not a weakly prime, because it can be changed into another prime (123323987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61660493 + 61660494.

It is an arithmetic number, because the mean of its divisors is an integer number (61660494).

Almost surely, 2^123320987 is an apocalyptic number.

123320987 is a deficient number, since it is larger than the sum of its proper divisors (1).

123320987 is an equidigital number, since it uses as much as digits as its factorization.

123320987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 123320987 is about 11104.9982890589. The cubic root of 123320987 is about 497.7512171139.

The spelling of 123320987 in words is "one hundred twenty-three million, three hundred twenty thousand, nine hundred eighty-seven".