123561239 has 2 divisors, whose sum is σ = 123561240. Its totient is φ = 123561238.

The previous prime is 123561227. The next prime is 123561247. The reversal of 123561239 is 932165321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123561239 - 2⁴ = 123561223 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 (123561209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61780619 + 61780620.

It is an arithmetic number, because the mean of its divisors is an integer number (61780620).

Almost surely, 2^123561239 is an apocalyptic number.

123561239 is a deficient number, since it is larger than the sum of its proper divisors (1).

123561239 is an equidigital number, since it uses as much as digits as its factorization.

123561239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 32.

The square root of 123561239 is about 11115.8103168415. The cubic root of 123561239 is about 498.0742444535.

The spelling of 123561239 in words is "one hundred twenty-three million, five hundred sixty-one thousand, two hundred thirty-nine".