861159240287 has 2 divisors, whose sum is σ = 861159240288. Its totient is φ = 861159240286.

The previous prime is 861159240281. The next prime is 861159240313. The reversal of 861159240287 is 782042951168.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861159240287 - 2⁸ = 861159240031 is a prime.

It is a super-3 number, since 3×861159240287³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861159240281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430579620143 + 430579620144.

It is an arithmetic number, because the mean of its divisors is an integer number (430579620144).

Almost surely, 2^861159240287 is an apocalyptic number.

861159240287 is a deficient number, since it is larger than the sum of its proper divisors (1).

861159240287 is an equidigital number, since it uses as much as digits as its factorization.

861159240287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1935360, while the sum is 53.

The spelling of 861159240287 in words is "eight hundred sixty-one billion, one hundred fifty-nine million, two hundred forty thousand, two hundred eighty-seven".