123561247 has 2 divisors, whose sum is σ = 123561248. Its totient is φ = 123561246.

The previous prime is 123561239. The next prime is 123561329. The reversal of 123561247 is 742165321.

It is a weak prime.

It is an emirp because it is prime and its reverse (742165321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123561247 - 2³ = 123561239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123561227) 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, 61780623 + 61780624.

It is an arithmetic number, because the mean of its divisors is an integer number (61780624).

Almost surely, 2^123561247 is an apocalyptic number.

123561247 is a deficient number, since it is larger than the sum of its proper divisors (1).

123561247 is an equidigital number, since it uses as much as digits as its factorization.

123561247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 123561247 is about 11115.8106766893. The cubic root of 123561247 is about 498.0742552028.

The spelling of 123561247 in words is "one hundred twenty-three million, five hundred sixty-one thousand, two hundred forty-seven".