91441857 has 16 divisors (see below), whose sum is σ = 131526080. Its totient is φ = 56175552.

The previous prime is 91441853. The next prime is 91441873. The reversal of 91441857 is 75814419.

It is not a de Polignac number, because 91441857 - 2² = 91441853 is a prime.

It is a super-2 number, since 2×91441857² = 16723226423216898, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

91441857 is a Rhonda number in base 10.

Its product of digits (40320) is a multiple of the sum of its prime divisors (4032).

It is not an unprimeable number, because it can be changed into a prime (91441853) 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 15 ways as a sum of consecutive naturals, for example, 25998 + ... + 29304.

It is an arithmetic number, because the mean of its divisors is an integer number (8220380).

Almost surely, 2^91441857 is an apocalyptic number.

It is an amenable number.

91441857 is a deficient number, since it is larger than the sum of its proper divisors (40084223).

91441857 is a wasteful number, since it uses less digits than its factorization.

91441857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4032.

The product of its digits is 40320, while the sum is 39.

The square root of 91441857 is about 9562.5235685984. The cubic root of 91441857 is about 450.5209719386.

The spelling of 91441857 in words is "ninety-one million, four hundred forty-one thousand, eight hundred fifty-seven".