87649587691 has 2 divisors, whose sum is σ = 87649587692. Its totient is φ = 87649587690.

The previous prime is 87649587689. The next prime is 87649587731. The reversal of 87649587691 is 19678594678.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87649587691 - 2¹ = 87649587689 is a prime.

It is a super-2 number, since 2×87649587691² (a number of 23 digits) contains 22 as substring.

Together with 87649587689, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 87649587691.

It is not a weakly prime, because it can be changed into another prime (87649587391) 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, 43824793845 + 43824793846.

It is an arithmetic number, because the mean of its divisors is an integer number (43824793846).

Almost surely, 2^87649587691 is an apocalyptic number.

87649587691 is a deficient number, since it is larger than the sum of its proper divisors (1).

87649587691 is an equidigital number, since it uses as much as digits as its factorization.

87649587691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 182891520, while the sum is 70.

The spelling of 87649587691 in words is "eighty-seven billion, six hundred forty-nine million, five hundred eighty-seven thousand, six hundred ninety-one".