1239540017 has 2 divisors, whose sum is σ = 1239540018. Its totient is φ = 1239540016.

The previous prime is 1239540013. The next prime is 1239540019. The reversal of 1239540017 is 7100459321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1190526016 + 49014001 = 34504^2 + 7001^2 .

It is an emirp because it is prime and its reverse (7100459321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1239540017 - 2² = 1239540013 is a prime.

Together with 1239540019, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1239540013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619770008 + 619770009.

It is an arithmetic number, because the mean of its divisors is an integer number (619770009).

Almost surely, 2^1239540017 is an apocalyptic number.

It is an amenable number.

1239540017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1239540017 is an equidigital number, since it uses as much as digits as its factorization.

1239540017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 1239540017 is about 35207.1017977907. The cubic root of 1239540017 is about 1074.2042113365.

Adding to 1239540017 its reverse (7100459321), we get a palindrome (8339999338).

The spelling of 1239540017 in words is "one billion, two hundred thirty-nine million, five hundred forty thousand, seventeen".