91281036 has 96 divisors (see below), whose sum is σ = 267337728. Its totient is φ = 23549760.

The previous prime is 91281023. The next prime is 91281037. The reversal of 91281036 is 63018219.

It is a junction number, because it is equal to n+sod(n) for n = 91280994 and 91281012.

It is not an unprimeable number, because it can be changed into a prime (91281037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 205831 + ... + 206273.

It is an arithmetic number, because the mean of its divisors is an integer number (2784768).

Almost surely, 2^91281036 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91281036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133668864).

91281036 is an abundant number, since it is smaller than the sum of its proper divisors (176056692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91281036 is a wasteful number, since it uses less digits than its factorization.

91281036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691 (or 689 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 91281036 is about 9554.1109476497. The cubic root of 91281036 is about 450.2567029185.

The spelling of 91281036 in words is "ninety-one million, two hundred eighty-one thousand, thirty-six".