87969691 has 2 divisors, whose sum is σ = 87969692. Its totient is φ = 87969690.

The previous prime is 87969689. The next prime is 87969697. The reversal of 87969691 is 19696978.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87969691 - 2¹ = 87969689 is a prime.

Together with 87969689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (87969697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43984845 + 43984846.

It is an arithmetic number, because the mean of its divisors is an integer number (43984846).

Almost surely, 2^87969691 is an apocalyptic number.

87969691 is a deficient number, since it is larger than the sum of its proper divisors (1).

87969691 is an equidigital number, since it uses as much as digits as its factorization.

87969691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 55.

The square root of 87969691 is about 9379.2159053942. The cubic root of 87969691 is about 444.7449466345.

The spelling of 87969691 in words is "eighty-seven million, nine hundred sixty-nine thousand, six hundred ninety-one".