616531 has 8 divisors (see below), whose sum is σ = 667280. Its totient is φ = 567648.

The previous prime is 616529. The next prime is 616537. The reversal of 616531 is 135616.

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

It is a cyclic number.

It is not a de Polignac number, because 616531 - 2¹ = 616529 is a prime.

It is a super-2 number, since 2×616531² = 760220947922, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (616537) 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, 265 + ... + 1141.

It is an arithmetic number, because the mean of its divisors is an integer number (83410).

2⁶¹⁶⁵³¹ is an apocalyptic number.

616531 is a deficient number, since it is larger than the sum of its proper divisors (50749).

616531 is a wasteful number, since it uses less digits than its factorization.

616531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933.

The product of its digits is 540, while the sum is 22.

The square root of 616531 is about 785.1948802686. The cubic root of 616531 is about 85.1108588129.

The spelling of 616531 in words is "six hundred sixteen thousand, five hundred thirty-one".