91161443481 has 32 divisors (see below), whose sum is σ = 126379733760. Its totient is φ = 58405248000.

The previous prime is 91161443459. The next prime is 91161443531. The reversal of 91161443481 is 18434416119.

It is not a de Polignac number, because 91161443481 - 2¹⁰ = 91161442457 is a prime.

It is a super-2 number, since 2×91161443481² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91161443081) 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 31 ways as a sum of consecutive naturals, for example, 7527331 + ... + 7539431.

It is an arithmetic number, because the mean of its divisors is an integer number (3949366680).

Almost surely, 2^91161443481 is an apocalyptic number.

It is an amenable number.

91161443481 is a deficient number, since it is larger than the sum of its proper divisors (35218290279).

91161443481 is a wasteful number, since it uses less digits than its factorization.

91161443481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13057.

The product of its digits is 82944, while the sum is 42.

The spelling of 91161443481 in words is "ninety-one billion, one hundred sixty-one million, four hundred forty-three thousand, four hundred eighty-one".