123242549 has 2 divisors, whose sum is σ = 123242550. Its totient is φ = 123242548.

The previous prime is 123242527. The next prime is 123242617. The reversal of 123242549 is 945242321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91680625 + 31561924 = 9575^2 + 5618^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123242549 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 (123242849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61621274 + 61621275.

It is an arithmetic number, because the mean of its divisors is an integer number (61621275).

Almost surely, 2^123242549 is an apocalyptic number.

It is an amenable number.

123242549 is a deficient number, since it is larger than the sum of its proper divisors (1).

123242549 is an equidigital number, since it uses as much as digits as its factorization.

123242549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 32.

The square root of 123242549 is about 11101.4660743525. The cubic root of 123242549 is about 497.6456636000.

The spelling of 123242549 in words is "one hundred twenty-three million, two hundred forty-two thousand, five hundred forty-nine".