5621581 has 8 divisors (see below), whose sum is σ = 6445440. Its totient is φ = 4802928.

The previous prime is 5621513. The next prime is 5621597. The reversal of 5621581 is 1851265.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5621581 is a prime.

It is a super-2 number, since 2×5621581² = 63204345879122, 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 (5621081) 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, 1395 + ... + 3631.

It is an arithmetic number, because the mean of its divisors is an integer number (805680).

Almost surely, 2^5621581 is an apocalyptic number.

It is an amenable number.

5621581 is a deficient number, since it is larger than the sum of its proper divisors (823859).

5621581 is a wasteful number, since it uses less digits than its factorization.

5621581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2603.

The product of its digits is 2400, while the sum is 28.

The square root of 5621581 is about 2370.9873470772. The cubic root of 5621581 is about 177.8086252750.

The spelling of 5621581 in words is "five million, six hundred twenty-one thousand, five hundred eighty-one".