91466581 has 4 divisors (see below), whose sum is σ = 92568672. Its totient is φ = 90364492.

The previous prime is 91466563. The next prime is 91466593. The reversal of 91466581 is 18566419.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91466581 - 2¹¹ = 91464533 is a prime.

It is a super-2 number, since 2×91466581² = 16732270879659122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91466521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550921 + ... + 551086.

It is an arithmetic number, because the mean of its divisors is an integer number (23142168).

Almost surely, 2^91466581 is an apocalyptic number.

It is an amenable number.

91466581 is a deficient number, since it is larger than the sum of its proper divisors (1102091).

91466581 is a wasteful number, since it uses less digits than its factorization.

91466581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102090.

The product of its digits is 51840, while the sum is 40.

The square root of 91466581 is about 9563.8162362103. The cubic root of 91466581 is about 450.5615721522.

The spelling of 91466581 in words is "ninety-one million, four hundred sixty-six thousand, five hundred eighty-one".