123988901 has 2 divisors, whose sum is σ = 123988902. Its totient is φ = 123988900.

The previous prime is 123988859. The next prime is 123988903. The reversal of 123988901 is 109889321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123988225 + 676 = 11135^2 + 26^2 .

It is a cyclic number.

It is not a de Polignac number, because 123988901 - 2²⁶ = 56880037 is a prime.

It is a Sophie Germain prime.

Together with 123988903, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123988903) 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, 61994450 + 61994451.

It is an arithmetic number, because the mean of its divisors is an integer number (61994451).

Almost surely, 2^123988901 is an apocalyptic number.

It is an amenable number.

123988901 is a deficient number, since it is larger than the sum of its proper divisors (1).

123988901 is an equidigital number, since it uses as much as digits as its factorization.

123988901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 123988901 is about 11135.0303546959. The cubic root of 123988901 is about 498.6482166571.

The spelling of 123988901 in words is "one hundred twenty-three million, nine hundred eighty-eight thousand, nine hundred one".