91000687 has 2 divisors, whose sum is σ = 91000688. Its totient is φ = 91000686.

The previous prime is 91000669. The next prime is 91000699. The reversal of 91000687 is 78600019.

It is a strong prime.

It is an emirp because it is prime and its reverse (78600019) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91000687 is a prime.

It is a super-2 number, since 2×91000687² = 16562250068943938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91000667) 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, 45500343 + 45500344.

It is an arithmetic number, because the mean of its divisors is an integer number (45500344).

Almost surely, 2^91000687 is an apocalyptic number.

91000687 is a deficient number, since it is larger than the sum of its proper divisors (1).

91000687 is an equidigital number, since it uses as much as digits as its factorization.

91000687 is an odious number, because the sum of its binary digits is odd.

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

The square root of 91000687 is about 9539.4280226856. The cubic root of 91000687 is about 449.7952764242.

The spelling of 91000687 in words is "ninety-one million, six hundred eighty-seven", and thus it is an aban number.