91018845 has 12 divisors (see below), whose sum is σ = 157766076. Its totient is φ = 48543360.

The previous prime is 91018817. The next prime is 91018847. The reversal of 91018845 is 54881019.

It can be written as a sum of positive squares in 2 ways, for example, as 68608089 + 22410756 = 8283^2 + 4734^2 .

It is not a de Polignac number, because 91018845 - 2⁷ = 91018717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91018847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1011276 + ... + 1011365.

It is an arithmetic number, because the mean of its divisors is an integer number (13147173).

Almost surely, 2^91018845 is an apocalyptic number.

It is an amenable number.

91018845 is a deficient number, since it is larger than the sum of its proper divisors (66747231).

91018845 is a wasteful number, since it uses less digits than its factorization.

91018845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022652 (or 2022649 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 91018845 is about 9540.3797094246. The cubic root of 91018845 is about 449.8251913613.

The spelling of 91018845 in words is "ninety-one million, eighteen thousand, eight hundred forty-five".