91299220 has 12 divisors (see below), whose sum is σ = 191728404. Its totient is φ = 36519680.

The previous prime is 91299217. The next prime is 91299227. The reversal of 91299220 is 2299219.

It can be written as a sum of positive squares in 2 ways, for example, as 10227204 + 81072016 = 3198^2 + 9004^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91299227) 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 3 ways as a sum of consecutive naturals, for example, 2282461 + ... + 2282500.

It is an arithmetic number, because the mean of its divisors is an integer number (15977367).

Almost surely, 2^91299220 is an apocalyptic number.

It is an amenable number.

91299220 is an abundant number, since it is smaller than the sum of its proper divisors (100429184).

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

91299220 is a wasteful number, since it uses less digits than its factorization.

91299220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4564970 (or 4564968 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 91299220 is about 9555.0625325008. The cubic root of 91299220 is about 450.2865993228.

It can be divided in two parts, 91299 and 220, that added together give a palindrome (91519).

The spelling of 91299220 in words is "ninety-one million, two hundred ninety-nine thousand, two hundred twenty".