5809981 has 4 divisors (see below), whose sum is σ = 5854464. Its totient is φ = 5765500.

The previous prime is 5809949. The next prime is 5810011. The reversal of 5809981 is 1899085.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1899085 = 5 ⋅379817.

It is a cyclic number.

It is not a de Polignac number, because 5809981 - 2⁵ = 5809949 is a prime.

It is a super-2 number, since 2×5809981² = 67511758440722, 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 (5809931) 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, 22045 + ... + 22306.

It is an arithmetic number, because the mean of its divisors is an integer number (1463616).

Almost surely, 2^5809981 is an apocalyptic number.

It is an amenable number.

5809981 is a deficient number, since it is larger than the sum of its proper divisors (44483).

5809981 is a wasteful number, since it uses less digits than its factorization.

5809981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44482.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 5809981 is about 2410.3902173715. The cubic root of 5809981 is about 179.7731813833.

The spelling of 5809981 in words is "five million, eight hundred nine thousand, nine hundred eighty-one".