123209899 has 2 divisors, whose sum is σ = 123209900. Its totient is φ = 123209898.

The previous prime is 123209887. The next prime is 123209917. The reversal of 123209899 is 998902321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123209899 is a prime.

It is not a weakly prime, because it can be changed into another prime (123209819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61604949 + 61604950.

It is an arithmetic number, because the mean of its divisors is an integer number (61604950).

Almost surely, 2^123209899 is an apocalyptic number.

123209899 is a deficient number, since it is larger than the sum of its proper divisors (1).

123209899 is an equidigital number, since it uses as much as digits as its factorization.

123209899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 123209899 is about 11099.9954504495. The cubic root of 123209899 is about 497.6017135030.

The spelling of 123209899 in words is "one hundred twenty-three million, two hundred nine thousand, eight hundred ninety-nine".