91287371045 has 64 divisors (see below), whose sum is σ = 122099140800. Its totient is φ = 65091624960.

The previous prime is 91287371029. The next prime is 91287371047. The reversal of 91287371045 is 54017378219.

It is a Cunningham number, because it is equal to 302138²+1.

It can be written as a sum of positive squares in 32 ways, for example, as 69737718241 + 21549652804 = 264079^2 + 146798^2 .

It is not a de Polignac number, because 91287371045 - 2⁴ = 91287371029 is a prime.

It is a super-2 number, since 2×91287371045² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91287371047) 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 63 ways as a sum of consecutive naturals, for example, 179346251 + ... + 179346759.

It is an arithmetic number, because the mean of its divisors is an integer number (1907799075).

Almost surely, 2^91287371045 is an apocalyptic number.

It is an amenable number.

91287371045 is a deficient number, since it is larger than the sum of its proper divisors (30811769755).

91287371045 is a wasteful number, since it uses less digits than its factorization.

91287371045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130.

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 91287371045 in words is "ninety-one billion, two hundred eighty-seven million, three hundred seventy-one thousand, forty-five".