91010928291 has 32 divisors (see below), whose sum is σ = 124068392448. Its totient is φ = 59326525440.

The previous prime is 91010928287. The next prime is 91010928301. The reversal of 91010928291 is 19282901019.

It is not a de Polignac number, because 91010928291 - 2² = 91010928287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91010928091) 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 31 ways as a sum of consecutive naturals, for example, 26324835 + ... + 26328291.

It is an arithmetic number, because the mean of its divisors is an integer number (3877137264).

Almost surely, 2^91010928291 is an apocalyptic number.

91010928291 is a deficient number, since it is larger than the sum of its proper divisors (33057464157).

91010928291 is a wasteful number, since it uses less digits than its factorization.

91010928291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4331.

The product of its (nonzero) digits is 23328, while the sum is 42.

The spelling of 91010928291 in words is "ninety-one billion, ten million, nine hundred twenty-eight thousand, two hundred ninety-one".