123731266489 has 2 divisors, whose sum is σ = 123731266490. Its totient is φ = 123731266488.

The previous prime is 123731266433. The next prime is 123731266493. The reversal of 123731266489 is 984662137321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115656446889 + 8074819600 = 340083^2 + 89860^2 .

It is a cyclic number.

It is not a de Polignac number, because 123731266489 - 2¹³ = 123731258297 is a prime.

It is not a weakly prime, because it can be changed into another prime (123731266189) 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, 61865633244 + 61865633245.

It is an arithmetic number, because the mean of its divisors is an integer number (61865633245).

Almost surely, 2^123731266489 is an apocalyptic number.

It is an amenable number.

123731266489 is a deficient number, since it is larger than the sum of its proper divisors (1).

123731266489 is an equidigital number, since it uses as much as digits as its factorization.

123731266489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 52.

The spelling of 123731266489 in words is "one hundred twenty-three billion, seven hundred thirty-one million, two hundred sixty-six thousand, four hundred eighty-nine".