5921581 has 4 divisors (see below), whose sum is σ = 5935392. Its totient is φ = 5907772.

The previous prime is 5921561. The next prime is 5921599. The reversal of 5921581 is 1851295.

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 5921581 - 2⁵ = 5921549 is a prime.

It is a super-2 number, since 2×5921581² = 70130243079122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

5921581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5921501) 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 3 ways as a sum of consecutive naturals, for example, 6241 + ... + 7126.

It is an arithmetic number, because the mean of its divisors is an integer number (1483848).

Almost surely, 2^5921581 is an apocalyptic number.

It is an amenable number.

5921581 is a deficient number, since it is larger than the sum of its proper divisors (13811).

5921581 is a wasteful number, since it uses less digits than its factorization.

5921581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13810.

The product of its digits is 3600, while the sum is 31.

The square root of 5921581 is about 2433.4298839293. The cubic root of 5921581 is about 180.9169363380.

The spelling of 5921581 in words is "five million, nine hundred twenty-one thousand, five hundred eighty-one".