123203851 has 2 divisors, whose sum is σ = 123203852. Its totient is φ = 123203850.

The previous prime is 123203849. The next prime is 123203867. The reversal of 123203851 is 158302321.

It is a weak prime.

It is an emirp because it is prime and its reverse (158302321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123203851 - 2¹ = 123203849 is a prime.

Together with 123203849, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (123203831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61601925 + 61601926.

It is an arithmetic number, because the mean of its divisors is an integer number (61601926).

Almost surely, 2^123203851 is an apocalyptic number.

123203851 is a deficient number, since it is larger than the sum of its proper divisors (1).

123203851 is an equidigital number, since it uses as much as digits as its factorization.

123203851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 123203851 is about 11099.7230145621. The cubic root of 123203851 is about 497.5935714504.

The spelling of 123203851 in words is "one hundred twenty-three million, two hundred three thousand, eight hundred fifty-one".