91212275049 has 24 divisors (see below), whose sum is σ = 141955007040. Its totient is φ = 51943387104.

The previous prime is 91212275039. The next prime is 91212275069. The reversal of 91212275049 is 94057221219.

It is not a de Polignac number, because 91212275049 - 2¹³ = 91212266857 is a prime.

It is a super-2 number, since 2×91212275049² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91212275049.

It is not an unprimeable number, because it can be changed into a prime (91212275039) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1015789 + ... + 1101930.

It is an arithmetic number, because the mean of its divisors is an integer number (5914791960).

Almost surely, 2^91212275049 is an apocalyptic number.

It is an amenable number.

91212275049 is a deficient number, since it is larger than the sum of its proper divisors (50742731991).

91212275049 is a wasteful number, since it uses less digits than its factorization.

91212275049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2118029 (or 2118022 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 91212275049 in words is "ninety-one billion, two hundred twelve million, two hundred seventy-five thousand, forty-nine".