505631 has 12 divisors (see below), whose sum is σ = 623808. Its totient is φ = 407232.

The previous prime is 505619. The next prime is 505633. The reversal of 505631 is 136505.

It is not a de Polignac number, because 505631 - 2¹⁰ = 504607 is a prime.

It is a super-2 number, since 2×505631² = 511325416322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 530 + ... + 1136.

It is an arithmetic number, because the mean of its divisors is an integer number (51984).

2⁵⁰⁵⁶³¹ is an apocalyptic number.

505631 is a deficient number, since it is larger than the sum of its proper divisors (118177).

505631 is a wasteful number, since it uses less digits than its factorization.

505631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 505631 is about 711.0773516292. The cubic root of 505631 is about 79.6668961982. Note that the first 3 decimals are identical.

The spelling of 505631 in words is "five hundred five thousand, six hundred thirty-one".