523631 has 2 divisors, whose sum is σ = 523632. Its totient is φ = 523630.

The previous prime is 523603. The next prime is 523637. The reversal of 523631 is 136325.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-523631 is a prime.

It is a super-2 number, since 2×523631² = 548378848322, which contains 22 as substring.

It is equal to p₄₃₃₃₇ and since 523631 and 43337 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (523637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261815 + 261816.

It is an arithmetic number, because the mean of its divisors is an integer number (261816).

2⁵²³⁶³¹ is an apocalyptic number.

523631 is a deficient number, since it is larger than the sum of its proper divisors (1).

523631 is an equidigital number, since it uses as much as digits as its factorization.

523631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 20.

The square root of 523631 is about 723.6235209002. The cubic root of 523631 is about 80.6012511428.

Adding to 523631 its reverse (136325), we get a palindrome (659956).

The spelling of 523631 in words is "five hundred twenty-three thousand, six hundred thirty-one".