531631 has 2 divisors, whose sum is σ = 531632. Its totient is φ = 531630.

The previous prime is 531623. The next prime is 531637. The reversal of 531631 is 136135.

531631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 531631 - 2³ = 531623 is a prime.

It is a super-2 number, since 2×531631² = 565263040322, which contains 22 as substring.

It is a Chen prime.

It is a d-powerful number, because it can be written as 5³ + 3³ + 6² + 1 + 3¹² + 1 .

It is a junction number, because it is equal to n+sod(n) for n = 531599 and 531608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265815 + 265816.

It is an arithmetic number, because the mean of its divisors is an integer number (265816).

2⁵³¹⁶³¹ is an apocalyptic number.

531631 is a deficient number, since it is larger than the sum of its proper divisors (1).

531631 is an equidigital number, since it uses as much as digits as its factorization.

531631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270, while the sum is 19.

The square root of 531631 is about 729.1303038552. The cubic root of 531631 is about 81.0096518499.

Adding to 531631 its reverse (136135), we get a palindrome (667766).

The spelling of 531631 in words is "five hundred thirty-one thousand, six hundred thirty-one".