91284887 has 4 divisors (see below), whose sum is σ = 92647416. Its totient is φ = 89922360.

The previous prime is 91284871. The next prime is 91284889. The reversal of 91284887 is 78848219.

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 91284887 - 2⁴ = 91284871 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 (91284889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 681164 + ... + 681297.

It is an arithmetic number, because the mean of its divisors is an integer number (23161854).

Almost surely, 2^91284887 is an apocalyptic number.

91284887 is a deficient number, since it is larger than the sum of its proper divisors (1362529).

91284887 is a wasteful number, since it uses less digits than its factorization.

91284887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362528.

The product of its digits is 258048, while the sum is 47.

The square root of 91284887 is about 9554.3124818063. The cubic root of 91284887 is about 450.2630346980.

The spelling of 91284887 in words is "ninety-one million, two hundred eighty-four thousand, eight hundred eighty-seven".