5981509 has 4 divisors (see below), whose sum is σ = 5987520. Its totient is φ = 5975500.

The previous prime is 5981491. The next prime is 5981533. The reversal of 5981509 is 9051895.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 5981509 - 2¹⁷ = 5850437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5981539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1117 + ... + 3634.

It is an arithmetic number, because the mean of its divisors is an integer number (1496880).

Almost surely, 2^5981509 is an apocalyptic number.

It is an amenable number.

5981509 is a deficient number, since it is larger than the sum of its proper divisors (6011).

5981509 is a wasteful number, since it uses less digits than its factorization.

5981509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6010.

The product of its (nonzero) digits is 16200, while the sum is 37.

The square root of 5981509 is about 2445.7123706601. The cubic root of 5981509 is about 181.5251984331.

The spelling of 5981509 in words is "five million, nine hundred eighty-one thousand, five hundred nine".