91181340 has 36 divisors (see below), whose sum is σ = 276583944. Its totient is φ = 24314976.

The previous prime is 91181327. The next prime is 91181341. The reversal of 91181340 is 4318119.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91181341) 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, 253102 + ... + 253461.

Almost surely, 2^91181340 is an apocalyptic number.

91181340 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91181340 is an abundant number, since it is smaller than the sum of its proper divisors (185402604).

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

91181340 is a wasteful number, since it uses less digits than its factorization.

91181340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506578 (or 506573 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 91181340 is about 9548.8920823308. The cubic root of 91181340 is about 450.0927216343.

Adding to 91181340 its reverse (4318119), we get a palindrome (95499459).

The spelling of 91181340 in words is "ninety-one million, one hundred eighty-one thousand, three hundred forty".