228531 has 8 divisors (see below), whose sum is σ = 322704. Its totient is φ = 143360.

The previous prime is 228523. The next prime is 228539. The reversal of 228531 is 135822.

It is an interprime number because it is at equal distance from previous prime (228523) and next prime (228539).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 228531 - 2³ = 228523 is a prime.

It is a super-2 number, since 2×228531² = 104452835922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 228498 and 228507.

It is not an unprimeable number, because it can be changed into a prime (228539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2190 + ... + 2291.

It is an arithmetic number, because the mean of its divisors is an integer number (40338).

2²²⁸⁵³¹ is an apocalyptic number.

228531 is a deficient number, since it is larger than the sum of its proper divisors (94173).

228531 is a wasteful number, since it uses less digits than its factorization.

228531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4501.

The product of its digits is 480, while the sum is 21.

The square root of 228531 is about 478.0491606519. The cubic root of 228531 is about 61.1385366952.

The spelling of 228531 in words is "two hundred twenty-eight thousand, five hundred thirty-one".