91223487 has 24 divisors (see below), whose sum is σ = 135504720. Its totient is φ = 59114880.

The previous prime is 91223459. The next prime is 91223519. The reversal of 91223487 is 78432219.

It is not a de Polignac number, because 91223487 - 2¹⁵ = 91190719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91223417) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47928 + ... + 49794.

It is an arithmetic number, because the mean of its divisors is an integer number (5646030).

Almost surely, 2^91223487 is an apocalyptic number.

91223487 is a deficient number, since it is larger than the sum of its proper divisors (44281233).

91223487 is a wasteful number, since it uses less digits than its factorization.

91223487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023 (or 2020 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 91223487 is about 9551.0987326066. The cubic root of 91223487 is about 450.1620601482.

The spelling of 91223487 in words is "ninety-one million, two hundred twenty-three thousand, four hundred eighty-seven".