91479845 has 4 divisors (see below), whose sum is σ = 109775820. Its totient is φ = 73183872.

The previous prime is 91479823. The next prime is 91479847. The reversal of 91479845 is 54897419.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58967041 + 32512804 = 7679^2 + 5702^2 .

It is a cyclic number.

It is not a de Polignac number, because 91479845 - 2⁶ = 91479781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91479845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91479847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9147980 + ... + 9147989.

It is an arithmetic number, because the mean of its divisors is an integer number (27443955).

Almost surely, 2^91479845 is an apocalyptic number.

It is an amenable number.

91479845 is a deficient number, since it is larger than the sum of its proper divisors (18295975).

91479845 is a wasteful number, since it uses less digits than its factorization.

91479845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18295974.

The product of its digits is 362880, while the sum is 47.

The square root of 91479845 is about 9564.5096581058. The cubic root of 91479845 is about 450.5833504519.

The spelling of 91479845 in words is "ninety-one million, four hundred seventy-nine thousand, eight hundred forty-five".