91443915 has 48 divisors (see below), whose sum is σ = 162402240. Its totient is φ = 47589120.

The previous prime is 91443907. The next prime is 91443917. The reversal of 91443915 is 51934419.

It is a happy number.

It is not a de Polignac number, because 91443915 - 2³ = 91443907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91443915.

It is not an unprimeable number, because it can be changed into a prime (91443917) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 505125 + ... + 505305.

It is an arithmetic number, because the mean of its divisors is an integer number (3383380).

Almost surely, 2^91443915 is an apocalyptic number.

91443915 is a deficient number, since it is larger than the sum of its proper divisors (70958325).

91443915 is a wasteful number, since it uses less digits than its factorization.

91443915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404 (or 401 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 91443915 is about 9562.6311755709. The cubic root of 91443915 is about 450.5243517373.

The spelling of 91443915 in words is "ninety-one million, four hundred forty-three thousand, nine hundred fifteen".