87686861 has 2 divisors, whose sum is σ = 87686862. Its totient is φ = 87686860.

The previous prime is 87686849. The next prime is 87686869. The reversal of 87686861 is 16868678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51566761 + 36120100 = 7181^2 + 6010^2 .

It is a cyclic number.

It is not a de Polignac number, because 87686861 - 2¹⁰ = 87685837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87686869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43843430 + 43843431.

It is an arithmetic number, because the mean of its divisors is an integer number (43843431).

Almost surely, 2^87686861 is an apocalyptic number.

It is an amenable number.

87686861 is a deficient number, since it is larger than the sum of its proper divisors (1).

87686861 is an equidigital number, since it uses as much as digits as its factorization.

87686861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 50.

The square root of 87686861 is about 9364.1262806521. The cubic root of 87686861 is about 444.2678040390.

The spelling of 87686861 in words is "eighty-seven million, six hundred eighty-six thousand, eight hundred sixty-one".