91211011146 has 40 divisors (see below), whose sum is σ = 215137090080. Its totient is φ = 28803476232.

The previous prime is 91211011141. The next prime is 91211011147. The reversal of 91211011146 is 64111011219.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (91211011141) 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 19 ways as a sum of consecutive naturals, for example, 14813526 + ... + 14819681.

It is an arithmetic number, because the mean of its divisors is an integer number (5378427252).

Almost surely, 2^91211011146 is an apocalyptic number.

91211011146 is an abundant number, since it is smaller than the sum of its proper divisors (123926078934).

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

91211011146 is a wasteful number, since it uses less digits than its factorization.

91211011146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29633240 (or 29633231 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The spelling of 91211011146 in words is "ninety-one billion, two hundred eleven million, eleven thousand, one hundred forty-six".