6609531 has 4 divisors (see below), whose sum is σ = 8812712. Its totient is φ = 4406352.

The previous prime is 6609523. The next prime is 6609553. The reversal of 6609531 is 1359066.

It is a happy number.

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

It is not a de Polignac number, because 6609531 - 2³ = 6609523 is a prime.

It is a super-2 number, since 2×6609531² = 87371800079922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6609571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1101586 + ... + 1101591.

It is an arithmetic number, because the mean of its divisors is an integer number (2203178).

Almost surely, 2^6609531 is an apocalyptic number.

6609531 is a deficient number, since it is larger than the sum of its proper divisors (2203181).

6609531 is a wasteful number, since it uses less digits than its factorization.

6609531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2203180.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 6609531 is about 2570.9008148896. The cubic root of 6609531 is about 187.6679952134.

It can be divided in two parts, 6609 and 531, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 6609531 in words is "six million, six hundred nine thousand, five hundred thirty-one".