83939240009 has 2 divisors, whose sum is σ = 83939240010. Its totient is φ = 83939240008.

The previous prime is 83939239973. The next prime is 83939240023. The reversal of 83939240009 is 90004293938.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79156134409 + 4783105600 = 281347^2 + 69160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83939240009 is a prime.

It is not a weakly prime, because it can be changed into another prime (83939240309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41969620004 + 41969620005.

It is an arithmetic number, because the mean of its divisors is an integer number (41969620005).

Almost surely, 2^83939240009 is an apocalyptic number.

It is an amenable number.

83939240009 is a deficient number, since it is larger than the sum of its proper divisors (1).

83939240009 is an equidigital number, since it uses as much as digits as its factorization.

83939240009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 47.

The spelling of 83939240009 in words is "eighty-three billion, nine hundred thirty-nine million, two hundred forty thousand, nine".