91283287 has 4 divisors (see below), whose sum is σ = 91524520. Its totient is φ = 91042056.

The previous prime is 91283273. The next prime is 91283323. The reversal of 91283287 is 78238219.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91283287 - 2¹⁹ = 90758999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91253287) 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 in 3 ways as a sum of consecutive naturals, for example, 120048 + ... + 120805.

It is an arithmetic number, because the mean of its divisors is an integer number (22881130).

Almost surely, 2^91283287 is an apocalyptic number.

91283287 is a deficient number, since it is larger than the sum of its proper divisors (241233).

91283287 is a wasteful number, since it uses less digits than its factorization.

91283287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241232.

The product of its digits is 48384, while the sum is 40.

The square root of 91283287 is about 9554.2287496166. The cubic root of 91283287 is about 450.2604040140.

The spelling of 91283287 in words is "ninety-one million, two hundred eighty-three thousand, two hundred eighty-seven".