861017234039 has 2 divisors, whose sum is σ = 861017234040. Its totient is φ = 861017234038.

The previous prime is 861017233949. The next prime is 861017234041. The reversal of 861017234039 is 930432710168.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861017234039 is a prime.

It is a Sophie Germain prime.

Together with 861017234041, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861017234339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430508617019 + 430508617020.

It is an arithmetic number, because the mean of its divisors is an integer number (430508617020).

Almost surely, 2^861017234039 is an apocalyptic number.

861017234039 is a deficient number, since it is larger than the sum of its proper divisors (1).

861017234039 is an equidigital number, since it uses as much as digits as its factorization.

861017234039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 861017234039 in words is "eight hundred sixty-one billion, seventeen million, two hundred thirty-four thousand, thirty-nine".