91445775009 has 16 divisors (see below), whose sum is σ = 122752456704. Its totient is φ = 60551586000.

The previous prime is 91445774941. The next prime is 91445775017. The reversal of 91445775009 is 90057754419.

It is not a de Polignac number, because 91445775009 - 2⁷ = 91445774881 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91445775019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6203722 + ... + 6218444.

It is an arithmetic number, because the mean of its divisors is an integer number (7672028544).

Almost surely, 2^91445775009 is an apocalyptic number.

It is an amenable number.

91445775009 is a deficient number, since it is larger than the sum of its proper divisors (31306681695).

91445775009 is a wasteful number, since it uses less digits than its factorization.

91445775009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28588.

The product of its (nonzero) digits is 1587600, while the sum is 51.

The spelling of 91445775009 in words is "ninety-one billion, four hundred forty-five million, seven hundred seventy-five thousand, nine".