91628858091 has 16 divisors (see below), whose sum is σ = 123448715264. Its totient is φ = 60447631104.

The previous prime is 91628858089. The next prime is 91628858137. The reversal of 91628858091 is 19085882619.

It is not a de Polignac number, because 91628858091 - 2¹ = 91628858089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91628858021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2561370 + ... + 2596896.

It is an arithmetic number, because the mean of its divisors is an integer number (7715544704).

Almost surely, 2^91628858091 is an apocalyptic number.

91628858091 is a deficient number, since it is larger than the sum of its proper divisors (31819857173).

91628858091 is a wasteful number, since it uses less digits than its factorization.

91628858091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44490.

The product of its (nonzero) digits is 2488320, while the sum is 57.

The spelling of 91628858091 in words is "ninety-one billion, six hundred twenty-eight million, eight hundred fifty-eight thousand, ninety-one".