123000391 has 2 divisors, whose sum is σ = 123000392. Its totient is φ = 123000390.

The previous prime is 123000377. The next prime is 123000419. The reversal of 123000391 is 193000321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123000391 - 2²¹ = 120903239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123000301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61500195 + 61500196.

It is an arithmetic number, because the mean of its divisors is an integer number (61500196).

Almost surely, 2^123000391 is an apocalyptic number.

123000391 is a deficient number, since it is larger than the sum of its proper divisors (1).

123000391 is an equidigital number, since it uses as much as digits as its factorization.

123000391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 123000391 is about 11090.5541340368. The cubic root of 123000391 is about 497.3195102957.

The spelling of 123000391 in words is "one hundred twenty-three million, three hundred ninety-one", and thus it is an aban number.