91550000 has 60 divisors (see below), whose sum is σ = 221829552. Its totient is φ = 36600000.

The previous prime is 91549963. The next prime is 91550009. The reversal of 91550000 is 5519.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (91550009) 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 11 ways as a sum of consecutive naturals, for example, 49085 + ... + 50915.

Almost surely, 2^91550000 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 91550000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110914776).

91550000 is an abundant number, since it is smaller than the sum of its proper divisors (130279552).

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

91550000 is an equidigital number, since it uses as much as digits as its factorization.

91550000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1864 (or 1838 counting only the distinct ones).

The product of its (nonzero) digits is 225, while the sum is 20.

The square root of 91550000 is about 9568.1764197782. The cubic root of 91550000 is about 450.6985036777.

Adding to 91550000 its reverse (5519), we get a palindrome (91555519).

The spelling of 91550000 in words is "ninety-one million, five hundred fifty thousand".