91816687 has 2 divisors, whose sum is σ = 91816688. Its totient is φ = 91816686.

The previous prime is 91816657. The next prime is 91816729. The reversal of 91816687 is 78661819.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91816687 - 2⁷ = 91816559 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91816657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45908343 + 45908344.

It is an arithmetic number, because the mean of its divisors is an integer number (45908344).

Almost surely, 2^91816687 is an apocalyptic number.

91816687 is a deficient number, since it is larger than the sum of its proper divisors (1).

91816687 is an equidigital number, since it uses as much as digits as its factorization.

91816687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 46.

The square root of 91816687 is about 9582.1024310952. The cubic root of 91816687 is about 451.1357107041.

The spelling of 91816687 in words is "ninety-one million, eight hundred sixteen thousand, six hundred eighty-seven".