91440811 has 12 divisors (see below), whose sum is σ = 116040600. Its totient is φ = 71252160.

The previous prime is 91440781. The next prime is 91440827. The reversal of 91440811 is 11804419.

It is not a de Polignac number, because 91440811 - 2⁹ = 91440299 is a prime.

It is a super-2 number, since 2×91440811² = 16722843832675442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91440811.

It is not an unprimeable number, because it can be changed into a prime (91440911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84286 + ... + 85363.

It is an arithmetic number, because the mean of its divisors is an integer number (9670050).

Almost surely, 2^91440811 is an apocalyptic number.

91440811 is a deficient number, since it is larger than the sum of its proper divisors (24599789).

91440811 is a wasteful number, since it uses less digits than its factorization.

91440811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169674 (or 169667 counting only the distinct ones).

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

The square root of 91440811 is about 9562.4688757663. The cubic root of 91440811 is about 450.5192541012.

It can be divided in two parts, 914408 and 11, that added together give a palindrome (914419).

The spelling of 91440811 in words is "ninety-one million, four hundred forty thousand, eight hundred eleven".