123203891 has 2 divisors, whose sum is σ = 123203892. Its totient is φ = 123203890.

The previous prime is 123203887. The next prime is 123203929. The reversal of 123203891 is 198302321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123203891 - 2² = 123203887 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (123203831) 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, 61601945 + 61601946.

It is an arithmetic number, because the mean of its divisors is an integer number (61601946).

Almost surely, 2^123203891 is an apocalyptic number.

123203891 is a deficient number, since it is larger than the sum of its proper divisors (1).

123203891 is an equidigital number, since it uses as much as digits as its factorization.

123203891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 123203891 is about 11099.7248164087. The cubic root of 123203891 is about 497.5936253009.

The spelling of 123203891 in words is "one hundred twenty-three million, two hundred three thousand, eight hundred ninety-one".