5631509 has 4 divisors (see below), whose sum is σ = 6064716. Its totient is φ = 5198304.

The previous prime is 5631499. The next prime is 5631523. The reversal of 5631509 is 9051365.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2220100 + 3411409 = 1490^2 + 1847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5631509 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5631569) 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, 216584 + ... + 216609.

It is an arithmetic number, because the mean of its divisors is an integer number (1516179).

Almost surely, 2^5631509 is an apocalyptic number.

It is an amenable number.

5631509 is a deficient number, since it is larger than the sum of its proper divisors (433207).

5631509 is a wasteful number, since it uses less digits than its factorization.

5631509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433206.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 5631509 is about 2373.0800660745. The cubic root of 5631509 is about 177.9132367628.

The spelling of 5631509 in words is "five million, six hundred thirty-one thousand, five hundred nine".