1243245239 has 2 divisors, whose sum is σ = 1243245240. Its totient is φ = 1243245238.

The previous prime is 1243245187. The next prime is 1243245247. The reversal of 1243245239 is 9325423421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1243245239 - 2⁸ = 1243244983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1243245199 and 1243245208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243245439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621622619 + 621622620.

It is an arithmetic number, because the mean of its divisors is an integer number (621622620).

Almost surely, 2^1243245239 is an apocalyptic number.

1243245239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243245239 is an equidigital number, since it uses as much as digits as its factorization.

1243245239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 35.

The square root of 1243245239 is about 35259.6829112231. The cubic root of 1243245239 is about 1075.2734805197.

The spelling of 1243245239 in words is "one billion, two hundred forty-three million, two hundred forty-five thousand, two hundred thirty-nine".