91131460 has 48 divisors (see below), whose sum is σ = 220429440. Its totient is φ = 31000320.

The previous prime is 91131437. The next prime is 91131463. The reversal of 91131460 is 6413119.

It is not an unprimeable number, because it can be changed into a prime (91131463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15856 + ... + 20824.

It is an arithmetic number, because the mean of its divisors is an integer number (4592280).

Almost surely, 2^91131460 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 91131460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110214720).

91131460 is an abundant number, since it is smaller than the sum of its proper divisors (129297980).

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

91131460 is a wasteful number, since it uses less digits than its factorization.

91131460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5116 (or 5114 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 91131460 is about 9546.2799037112. The cubic root of 91131460 is about 450.0106334936.

Adding to 91131460 its reverse (6413119), we get a palindrome (97544579).

The spelling of 91131460 in words is "ninety-one million, one hundred thirty-one thousand, four hundred sixty".