123199121 has 4 divisors (see below), whose sum is σ = 123228672. Its totient is φ = 123169572.

The previous prime is 123199117. The next prime is 123199123. The reversal of 123199121 is 121991321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123199121 - 2² = 123199117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123199123) 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 in 3 ways as a sum of consecutive naturals, for example, 7241 + ... + 17286.

It is an arithmetic number, because the mean of its divisors is an integer number (30807168).

Almost surely, 2^123199121 is an apocalyptic number.

It is an amenable number.

123199121 is a deficient number, since it is larger than the sum of its proper divisors (29551).

123199121 is an equidigital number, since it uses as much as digits as its factorization.

123199121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29550.

The product of its digits is 972, while the sum is 29.

The square root of 123199121 is about 11099.5099441372. The cubic root of 123199121 is about 497.5872035550.

The spelling of 123199121 in words is "one hundred twenty-three million, one hundred ninety-nine thousand, one hundred twenty-one".