228631 has 8 divisors (see below), whose sum is σ = 252560. Its totient is φ = 205632.

The previous prime is 228619. The next prime is 228637. The reversal of 228631 is 136822.

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 228631 - 2¹⁵ = 195863 is a prime.

It is a super-2 number, since 2×228631² = 104544268322, which contains 22 as substring.

It is a Duffinian number.

228631 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228637) 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, 355 + ... + 763.

It is an arithmetic number, because the mean of its divisors is an integer number (31570).

2²²⁸⁶³¹ is an apocalyptic number.

228631 is a deficient number, since it is larger than the sum of its proper divisors (23929).

228631 is a wasteful number, since it uses less digits than its factorization.

228631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465.

The product of its digits is 576, while the sum is 22.

The square root of 228631 is about 478.1537409662. The cubic root of 228631 is about 61.1474530088.

Subtracting from 228631 its reverse (136822), we obtain a square (91809 = 303²).

The spelling of 228631 in words is "two hundred twenty-eight thousand, six hundred thirty-one".