91140830 has 24 divisors (see below), whose sum is σ = 180325656. Its totient is φ = 33141680.

The previous prime is 91140793. The next prime is 91140839. The reversal of 91140830 is 3804119.

It is a self number, because there is not a number n which added to its sum of digits gives 91140830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91140839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36452 + ... + 38871.

It is an arithmetic number, because the mean of its divisors is an integer number (7513569).

Almost surely, 2^91140830 is an apocalyptic number.

91140830 is a deficient number, since it is larger than the sum of its proper divisors (89184826).

91140830 is a wasteful number, since it uses less digits than its factorization.

91140830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75352 (or 75341 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 91140830 is about 9546.7706581859. The cubic root of 91140830 is about 450.0260561044.

Adding to 91140830 its reverse (3804119), we get a palindrome (94944949).

The spelling of 91140830 in words is "ninety-one million, one hundred forty thousand, eight hundred thirty".