91001818194 has 64 divisors (see below), whose sum is σ = 211951534080. Its totient is φ = 25511734080.

The previous prime is 91001818183. The next prime is 91001818273. The reversal of 91001818194 is 49181810019.

It is a happy number.

It is a super-2 number, since 2×91001818194² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 375039 + ... + 568029.

It is an arithmetic number, because the mean of its divisors is an integer number (3311742720).

Almost surely, 2^91001818194 is an apocalyptic number.

91001818194 is an abundant number, since it is smaller than the sum of its proper divisors (120949715886).

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

91001818194 is a wasteful number, since it uses less digits than its factorization.

91001818194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193215.

The product of its (nonzero) digits is 20736, while the sum is 42.

The spelling of 91001818194 in words is "ninety-one billion, one million, eight hundred eighteen thousand, one hundred ninety-four".