239871943709 has 2 divisors, whose sum is σ = 239871943710. Its totient is φ = 239871943708.

The previous prime is 239871943699. The next prime is 239871943783. The reversal of 239871943709 is 907349178932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226680732100 + 13191211609 = 476110^2 + 114853^2 .

It is a cyclic number.

It is not a de Polignac number, because 239871943709 - 2⁸ = 239871943453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239871943799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119935971854 + 119935971855.

It is an arithmetic number, because the mean of its divisors is an integer number (119935971855).

Almost surely, 2^239871943709 is an apocalyptic number.

It is an amenable number.

239871943709 is a deficient number, since it is larger than the sum of its proper divisors (1).

239871943709 is an equidigital number, since it uses as much as digits as its factorization.

239871943709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20575296, while the sum is 62.

The spelling of 239871943709 in words is "two hundred thirty-nine billion, eight hundred seventy-one million, nine hundred forty-three thousand, seven hundred nine".