91099448 has 24 divisors (see below), whose sum is σ = 187753440. Its totient is φ = 41408400.

The previous prime is 91099429. The next prime is 91099451. The reversal of 91099448 is 84499019.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 91099399 and 91099408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46088 + ... + 48023.

It is an arithmetic number, because the mean of its divisors is an integer number (7823060).

Almost surely, 2^91099448 is an apocalyptic number.

It is an amenable number.

91099448 is an abundant number, since it is smaller than the sum of its proper divisors (96653992).

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

91099448 is a wasteful number, since it uses less digits than its factorization.

91099448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94139 (or 94124 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 91099448 is about 9544.6030823707. The cubic root of 91099448 is about 449.9579351627.

The spelling of 91099448 in words is "ninety-one million, ninety-nine thousand, four hundred forty-eight".