123989321 has 2 divisors, whose sum is σ = 123989322. Its totient is φ = 123989320.

The previous prime is 123989311. The next prime is 123989323.

123989321 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101284096 + 22705225 = 10064^2 + 4765^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 123989321 - 2²⁶ = 56880457 is a prime.

Together with 123989323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123989323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61994660 + 61994661.

It is an arithmetic number, because the mean of its divisors is an integer number (61994661).

Almost surely, 2^123989321 is an apocalyptic number.

It is an amenable number.

123989321 is a deficient number, since it is larger than the sum of its proper divisors (1).

123989321 is an equidigital number, since it uses as much as digits as its factorization.

123989321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 123989321 is about 11135.0492140807. The cubic root of 123989321 is about 498.6487796968.

The spelling of 123989321 in words is "one hundred twenty-three million, nine hundred eighty-nine thousand, three hundred twenty-one".