609531 has 8 divisors (see below), whose sum is σ = 875280. Its totient is φ = 375072.

The previous prime is 609527. The next prime is 609533. The reversal of 609531 is 135906.

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

It is not a de Polignac number, because 609531 - 2² = 609527 is a prime.

It is a super-2 number, since 2×609531² = 743056079922, which contains 22 as substring.

609531 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (609533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7776 + ... + 7853.

It is an arithmetic number, because the mean of its divisors is an integer number (109410).

2⁶⁰⁹⁵³¹ is an apocalyptic number.

609531 is a deficient number, since it is larger than the sum of its proper divisors (265749).

609531 is a wasteful number, since it uses less digits than its factorization.

609531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15645.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 609531 is about 780.7246633737. The cubic root of 609531 is about 84.7875200425.

It can be divided in two parts, 60 and 9531, that added together give a triangular number (9591 = T₁₃₈).

The spelling of 609531 in words is "six hundred nine thousand, five hundred thirty-one".