91100420 has 12 divisors (see below), whose sum is σ = 191310924. Its totient is φ = 36440160.

The previous prime is 91100419. The next prime is 91100431. The reversal of 91100420 is 2400119.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 62220544 + 28879876 = 7888^2 + 5374^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2277491 + ... + 2277530.

It is an arithmetic number, because the mean of its divisors is an integer number (15942577).

Almost surely, 2^91100420 is an apocalyptic number.

It is an amenable number.

91100420 is an abundant number, since it is smaller than the sum of its proper divisors (100210504).

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

91100420 is a wasteful number, since it uses less digits than its factorization.

91100420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4555030 (or 4555028 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 91100420 is about 9544.6540010626. The cubic root of 91100420 is about 449.9595354561.

Adding to 91100420 its reverse (2400119), we get a palindrome (93500539).

The spelling of 91100420 in words is "ninety-one million, one hundred thousand, four hundred twenty".