123543989 has 2 divisors, whose sum is σ = 123543990. Its totient is φ = 123543988.

The previous prime is 123543967. The next prime is 123544033. The reversal of 123543989 is 989345321.

It is an a-pointer prime, because the next prime (123544033) can be obtained adding 123543989 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69639025 + 53904964 = 8345^2 + 7342^2 .

It is a cyclic number.

It is not a de Polignac number, because 123543989 - 2²⁴ = 106766773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123543929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61771994 + 61771995.

It is an arithmetic number, because the mean of its divisors is an integer number (61771995).

Almost surely, 2^123543989 is an apocalyptic number.

It is an amenable number.

123543989 is a deficient number, since it is larger than the sum of its proper divisors (1).

123543989 is an equidigital number, since it uses as much as digits as its factorization.

123543989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 44.

The square root of 123543989 is about 11115.0343679181. The cubic root of 123543989 is about 498.0510651764.

The spelling of 123543989 in words is "one hundred twenty-three million, five hundred forty-three thousand, nine hundred eighty-nine".