91981441 has 8 divisors (see below), whose sum is σ = 97857504. Its totient is φ = 86157120.

The previous prime is 91981403. The next prime is 91981453. The reversal of 91981441 is 14418919.

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 91981441 - 2⁷ = 91981313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91981441.

It is not an unprimeable number, because it can be changed into a prime (91981471) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 9235 + ... + 16408.

It is an arithmetic number, because the mean of its divisors is an integer number (12232188).

Almost surely, 2^91981441 is an apocalyptic number.

It is an amenable number.

91981441 is a deficient number, since it is larger than the sum of its proper divisors (5876063).

91981441 is a wasteful number, since it uses less digits than its factorization.

91981441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25871.

The product of its digits is 10368, while the sum is 37.

The square root of 91981441 is about 9590.6955430772. The cubic root of 91981441 is about 451.4053857235.

The spelling of 91981441 in words is "ninety-one million, nine hundred eighty-one thousand, four hundred forty-one".