91135055515 has 32 divisors (see below), whose sum is σ = 125824748544. Its totient is φ = 62073889920.

The previous prime is 91135055449. The next prime is 91135055569. The reversal of 91135055515 is 51555053119.

It is not a de Polignac number, because 91135055515 - 2¹⁹ = 91134531227 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 4340272 + ... + 4361218.

It is an arithmetic number, because the mean of its divisors is an integer number (3932023392).

Almost surely, 2^91135055515 is an apocalyptic number.

91135055515 is a deficient number, since it is larger than the sum of its proper divisors (34689693029).

91135055515 is a wasteful number, since it uses less digits than its factorization.

91135055515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21787.

The product of its (nonzero) digits is 84375, while the sum is 40.

The spelling of 91135055515 in words is "ninety-one billion, one hundred thirty-five million, fifty-five thousand, five hundred fifteen".