863440887181 has 2 divisors, whose sum is σ = 863440887182. Its totient is φ = 863440887180.

The previous prime is 863440887109. The next prime is 863440887193. The reversal of 863440887181 is 181788044368.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 802448682025 + 60992205156 = 895795^2 + 246966^2 .

It is a cyclic number.

It is not a de Polignac number, because 863440887181 - 2¹⁷ = 863440756109 is a prime.

It is a super-2 number, since 2×863440887181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (863440888181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431720443590 + 431720443591.

It is an arithmetic number, because the mean of its divisors is an integer number (431720443591).

Almost surely, 2^863440887181 is an apocalyptic number.

It is an amenable number.

863440887181 is a deficient number, since it is larger than the sum of its proper divisors (1).

863440887181 is an equidigital number, since it uses as much as digits as its factorization.

863440887181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8257536, while the sum is 58.

It can be divided in two parts, 863 and 440887181, that added together give a palindrome (440888044).

The spelling of 863440887181 in words is "eight hundred sixty-three billion, four hundred forty million, eight hundred eighty-seven thousand, one hundred eighty-one".