91487121 has 16 divisors (see below), whose sum is σ = 134949888. Its totient is φ = 54664400.

The previous prime is 91487119. The next prime is 91487171. The reversal of 91487121 is 12178419.

It is a cyclic number.

It is not a de Polignac number, because 91487121 - 2¹ = 91487119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (91487171) 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 15 ways as a sum of consecutive naturals, for example, 17181 + ... + 21866.

It is an arithmetic number, because the mean of its divisors is an integer number (8434368).

Almost surely, 2^91487121 is an apocalyptic number.

It is an amenable number.

91487121 is a deficient number, since it is larger than the sum of its proper divisors (43462767).

91487121 is a wasteful number, since it uses less digits than its factorization.

91487121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39132.

The product of its digits is 4032, while the sum is 33.

The square root of 91487121 is about 9564.8900150498. The cubic root of 91487121 is about 450.5952960979.

The spelling of 91487121 in words is "ninety-one million, four hundred eighty-seven thousand, one hundred twenty-one".