123612489989 has 2 divisors, whose sum is σ = 123612489990. Its totient is φ = 123612489988.

The previous prime is 123612489953. The next prime is 123612490009. The reversal of 123612489989 is 989984216321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120388180900 + 3224309089 = 346970^2 + 56783^2 .

It is an emirp because it is prime and its reverse (989984216321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123612489989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123612489289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61806244994 + 61806244995.

It is an arithmetic number, because the mean of its divisors is an integer number (61806244995).

Almost surely, 2^123612489989 is an apocalyptic number.

It is an amenable number.

123612489989 is a deficient number, since it is larger than the sum of its proper divisors (1).

123612489989 is an equidigital number, since it uses as much as digits as its factorization.

123612489989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13436928, while the sum is 62.

The spelling of 123612489989 in words is "one hundred twenty-three billion, six hundred twelve million, four hundred eighty-nine thousand, nine hundred eighty-nine".