123203029979 has 2 divisors, whose sum is σ = 123203029980. Its totient is φ = 123203029978.

The previous prime is 123203029921. The next prime is 123203029997. The reversal of 123203029979 is 979920302321.

Together with next prime (123203029997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123203029979 - 2²⁰ = 123201981403 is a prime.

It is not a weakly prime, because it can be changed into another prime (123203029379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61601514989 + 61601514990.

It is an arithmetic number, because the mean of its divisors is an integer number (61601514990).

Almost surely, 2^123203029979 is an apocalyptic number.

123203029979 is a deficient number, since it is larger than the sum of its proper divisors (1).

123203029979 is an equidigital number, since it uses as much as digits as its factorization.

123203029979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 47.

The spelling of 123203029979 in words is "one hundred twenty-three billion, two hundred three million, twenty-nine thousand, nine hundred seventy-nine".