91211248 has 40 divisors (see below), whose sum is σ = 187349120. Its totient is φ = 42897600.

The previous prime is 91211233. The next prime is 91211249. The reversal of 91211248 is 84211219.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91211249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44911 + ... + 46897.

It is an arithmetic number, because the mean of its divisors is an integer number (4683728).

Almost surely, 2^91211248 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 91211248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93674560).

91211248 is an abundant number, since it is smaller than the sum of its proper divisors (96137872).

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

91211248 is a wasteful number, since it uses less digits than its factorization.

91211248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165 (or 2159 counting only the distinct ones).

The product of its digits is 1152, while the sum is 28.

The square root of 91211248 is about 9550.4579994888. The cubic root of 91211248 is about 450.1419272488.

The spelling of 91211248 in words is "ninety-one million, two hundred eleven thousand, two hundred forty-eight".