91530450 has 162 divisors, whose sum is σ = 277053231. Its totient is φ = 21648000.

The previous prime is 91530421. The next prime is 91530451. The reversal of 91530450 is 5403519.

91530450 is a `hidden beast` number, since 91 + 530 + 45 + 0 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 576081 + 90954369 = 759^2 + 9537^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=6765.

It is not an unprimeable number, because it can be changed into a prime (91530451) 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 80 ways as a sum of consecutive naturals, for example, 2232430 + ... + 2232470.

Almost surely, 2^91530450 is an apocalyptic number.

91530450 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 91530450

91530450 is an abundant number, since it is smaller than the sum of its proper divisors (185522781).

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

91530450 is a wasteful number, since it uses less digits than its factorization.

91530450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 62 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 91530450 is about 9567.1547494540. The cubic root of 91530450 is about 450.6664199966. Note that the first 3 decimals are identical.

Adding to 91530450 its reverse (5403519), we get a palindrome (96933969).

The spelling of 91530450 in words is "ninety-one million, five hundred thirty thousand, four hundred fifty".