91966487 has 2 divisors, whose sum is σ = 91966488. Its totient is φ = 91966486.

The previous prime is 91966471. The next prime is 91966499. The reversal of 91966487 is 78466919.

It is a strong prime.

It is an emirp because it is prime and its reverse (78466919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91966487 - 2⁴ = 91966471 is a prime.

It is a super-3 number, since 3×91966487³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91966387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45983243 + 45983244.

It is an arithmetic number, because the mean of its divisors is an integer number (45983244).

Almost surely, 2^91966487 is an apocalyptic number.

91966487 is a deficient number, since it is larger than the sum of its proper divisors (1).

91966487 is an equidigital number, since it uses as much as digits as its factorization.

91966487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 50.

The square root of 91966487 is about 9589.9159016125. The cubic root of 91966487 is about 451.3809217957.

The spelling of 91966487 in words is "ninety-one million, nine hundred sixty-six thousand, four hundred eighty-seven".