123649249 has 2 divisors, whose sum is σ = 123649250. Its totient is φ = 123649248.

The previous prime is 123649241. The next prime is 123649277. The reversal of 123649249 is 942946321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71520849 + 52128400 = 8457^2 + 7220^2 .

It is a cyclic number.

It is not a de Polignac number, because 123649249 - 2³ = 123649241 is a prime.

It is not a weakly prime, because it can be changed into another prime (123649241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61824624 + 61824625.

It is an arithmetic number, because the mean of its divisors is an integer number (61824625).

Almost surely, 2^123649249 is an apocalyptic number.

It is an amenable number.

123649249 is a deficient number, since it is larger than the sum of its proper divisors (1).

123649249 is an equidigital number, since it uses as much as digits as its factorization.

123649249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 40.

The square root of 123649249 is about 11119.7683878757. The cubic root of 123649249 is about 498.1924722273.

The spelling of 123649249 in words is "one hundred twenty-three million, six hundred forty-nine thousand, two hundred forty-nine".