91441681 has 16 divisors (see below), whose sum is σ = 95800320. Its totient is φ = 87225040.

The previous prime is 91441627. The next prime is 91441711. The reversal of 91441681 is 18614419.

It is a cyclic number.

It is not a de Polignac number, because 91441681 - 2¹¹ = 91439633 is a prime.

It is a super-2 number, since 2×91441681² = 16723162048211522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91441601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 347556 + ... + 347818.

It is an arithmetic number, because the mean of its divisors is an integer number (5987520).

Almost surely, 2^91441681 is an apocalyptic number.

It is an amenable number.

91441681 is a deficient number, since it is larger than the sum of its proper divisors (4358639).

91441681 is a wasteful number, since it uses less digits than its factorization.

91441681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476.

The product of its digits is 6912, while the sum is 34.

The square root of 91441681 is about 9562.5143660023. The cubic root of 91441681 is about 450.5206828962.

The spelling of 91441681 in words is "ninety-one million, four hundred forty-one thousand, six hundred eighty-one".