91353450581 has 8 divisors (see below), whose sum is σ = 93585609600. Its totient is φ = 89121483360.

The previous prime is 91353450577. The next prime is 91353450599. The reversal of 91353450581 is 18505435319.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91353450581 - 2² = 91353450577 is a prime.

It is a super-2 number, since 2×91353450581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91353450281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1596260 + ... + 1652498.

It is an arithmetic number, because the mean of its divisors is an integer number (11698201200).

Almost surely, 2^91353450581 is an apocalyptic number.

It is an amenable number.

91353450581 is a deficient number, since it is larger than the sum of its proper divisors (2232159019).

91353450581 is a wasteful number, since it uses less digits than its factorization.

91353450581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95899.

The product of its (nonzero) digits is 324000, while the sum is 44.

The spelling of 91353450581 in words is "ninety-one billion, three hundred fifty-three million, four hundred fifty thousand, five hundred eighty-one".