87691 has 2 divisors, whose sum is σ = 87692. Its totient is φ = 87690.

The previous prime is 87683. The next prime is 87697. The reversal of 87691 is 19678.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87691 - 2³ = 87683 is a prime.

It is a super-2 number, since 2×87691² = 15379422962, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (87697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43845 + 43846.

It is an arithmetic number, because the mean of its divisors is an integer number (43846).

2⁸⁷⁶⁹¹ is an apocalyptic number.

87691 is a deficient number, since it is larger than the sum of its proper divisors (1).

87691 is an equidigital number, since it uses as much as digits as its factorization.

87691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 87691 is about 296.1266620890. The cubic root of 87691 is about 44.4274794047.

The spelling of 87691 in words is "eighty-seven thousand, six hundred ninety-one".