91144956520 has 32 divisors (see below), whose sum is σ = 210078013320. Its totient is φ = 35568762880.

The previous prime is 91144956499. The next prime is 91144956523. The reversal of 91144956520 is 2565944119.

It can be written as a sum of positive squares in 4 ways, for example, as 50499977284 + 40644979236 = 224722^2 + 201606^2 .

It is not an unprimeable number, because it can be changed into a prime (91144956523) 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 7 ways as a sum of consecutive naturals, for example, 27786457 + ... + 27789736.

Almost surely, 2^91144956520 is an apocalyptic number.

It is an amenable number.

91144956520 is an abundant number, since it is smaller than the sum of its proper divisors (118933056800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91144956520 is a wasteful number, since it uses less digits than its factorization.

91144956520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55576245 (or 55576241 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 91144956520 in words is "ninety-one billion, one hundred forty-four million, nine hundred fifty-six thousand, five hundred twenty".