123968989 has 2 divisors, whose sum is σ = 123968990. Its totient is φ = 123968988.

The previous prime is 123968963. The next prime is 123968993. The reversal of 123968989 is 989869321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116856100 + 7112889 = 10810^2 + 2667^2 .

It is a cyclic number.

It is not a de Polignac number, because 123968989 - 2¹³ = 123960797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123968909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61984494 + 61984495.

It is an arithmetic number, because the mean of its divisors is an integer number (61984495).

Almost surely, 2^123968989 is an apocalyptic number.

It is an amenable number.

123968989 is a deficient number, since it is larger than the sum of its proper divisors (1).

123968989 is an equidigital number, since it uses as much as digits as its factorization.

123968989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 55.

The square root of 123968989 is about 11134.1362035858. The cubic root of 123968989 is about 498.6215217546.

The spelling of 123968989 in words is "one hundred twenty-three million, nine hundred sixty-eight thousand, nine hundred eighty-nine".