531638 has 4 divisors (see below), whose sum is σ = 797460. Its totient is φ = 265818.

The previous prime is 531637. The next prime is 531667. The reversal of 531638 is 836135.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a d-powerful number, because it can be written as 5³ + 3³ + 6² + 1 + 3¹² + 8 .

It is a plaindrome in base 11.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132908 + ... + 132911.

It is an arithmetic number, because the mean of its divisors is an integer number (199365).

2⁵³¹⁶³⁸ is an apocalyptic number.

531638 is a deficient number, since it is larger than the sum of its proper divisors (265822).

531638 is a wasteful number, since it uses less digits than its factorization.

531638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265821.

The product of its digits is 2160, while the sum is 26.

The square root of 531638 is about 729.1351040788. The cubic root of 531638 is about 81.0100074004.

The spelling of 531638 in words is "five hundred thirty-one thousand, six hundred thirty-eight".