263531 has 4 divisors (see below), whose sum is σ = 272064. Its totient is φ = 255000.

The previous prime is 263521. The next prime is 263533. The reversal of 263531 is 135362.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263531 is a prime.

It is a super-2 number, since 2×263531² = 138897175922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4220 + ... + 4281.

It is an arithmetic number, because the mean of its divisors is an integer number (68016).

2²⁶³⁵³¹ is an apocalyptic number.

263531 is a deficient number, since it is larger than the sum of its proper divisors (8533).

263531 is an equidigital number, since it uses as much as digits as its factorization.

263531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8532.

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

The square root of 263531 is about 513.3527052622. The cubic root of 263531 is about 64.1126758599.

Adding to 263531 its reverse (135362), we get a palindrome (398893).

It can be divided in two parts, 26 and 3531, that multiplied together give a triangular number (91806 = T₄₂₈).

The spelling of 263531 in words is "two hundred sixty-three thousand, five hundred thirty-one".