681182087 has 2 divisors, whose sum is σ = 681182088. Its totient is φ = 681182086.

The previous prime is 681182083. The next prime is 681182119. The reversal of 681182087 is 780281186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681182087 - 2² = 681182083 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681182083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340591043 + 340591044.

It is an arithmetic number, because the mean of its divisors is an integer number (340591044).

Almost surely, 2^681182087 is an apocalyptic number.

681182087 is a deficient number, since it is larger than the sum of its proper divisors (1).

681182087 is an equidigital number, since it uses as much as digits as its factorization.

681182087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 41.

The square root of 681182087 is about 26099.4652627214. The cubic root of 681182087 is about 879.8751919243.

Subtracting 681182087 from its reverse (780281186), we obtain a palindrome (99099099).

The spelling of 681182087 in words is "six hundred eighty-one million, one hundred eighty-two thousand, eighty-seven".