91215927 has 12 divisors (see below), whose sum is σ = 143734344. Its totient is φ = 55282320.

The previous prime is 91215899. The next prime is 91215937. The reversal of 91215927 is 72951219.

It is not a de Polignac number, because 91215927 - 2¹⁵ = 91183159 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91215891 and 91215900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91215937) 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 11 ways as a sum of consecutive naturals, for example, 460588 + ... + 460785.

It is an arithmetic number, because the mean of its divisors is an integer number (11977862).

Almost surely, 2^91215927 is an apocalyptic number.

91215927 is a deficient number, since it is larger than the sum of its proper divisors (52518417).

91215927 is a wasteful number, since it uses less digits than its factorization.

91215927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921390 (or 921387 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 91215927 is about 9550.7029584214. The cubic root of 91215927 is about 450.1496243187.

The spelling of 91215927 in words is "ninety-one million, two hundred fifteen thousand, nine hundred twenty-seven".