91212060 has 48 divisors (see below), whose sum is σ = 256951296. Its totient is φ = 24174912.

The previous prime is 91212041. The next prime is 91212061. The reversal of 91212060 is 6021219.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91212061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5469 + ... + 14571.

It is an arithmetic number, because the mean of its divisors is an integer number (5353152).

Almost surely, 2^91212060 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 91212060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128475648).

91212060 is an abundant number, since it is smaller than the sum of its proper divisors (165739236).

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

91212060 is a wasteful number, since it uses less digits than its factorization.

91212060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9282 (or 9280 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 91212060 is about 9550.5005104445. The cubic root of 91212060 is about 450.1432630276.

Adding to 91212060 its reverse (6021219), we get a palindrome (97233279).

The spelling of 91212060 in words is "ninety-one million, two hundred twelve thousand, sixty".