91011940 has 24 divisors (see below), whose sum is σ = 191355192. Its totient is φ = 36360960.

The previous prime is 91011911. The next prime is 91011967. The reversal of 91011940 is 4911019.

It can be written as a sum of positive squares in 4 ways, for example, as 18455616 + 72556324 = 4296^2 + 8518^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18192 + ... + 22648.

It is an arithmetic number, because the mean of its divisors is an integer number (7973133).

Almost surely, 2^91011940 is an apocalyptic number.

It is an amenable number.

91011940 is an abundant number, since it is smaller than the sum of its proper divisors (100343252).

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

91011940 is a wasteful number, since it uses less digits than its factorization.

91011940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5487 (or 5485 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 91011940 is about 9540.0178196899. The cubic root of 91011940 is about 449.8138159825.

Adding to 91011940 its reverse (4911019), we get a palindrome (95922959).

The spelling of 91011940 in words is "ninety-one million, eleven thousand, nine hundred forty".