228431 has 4 divisors (see below), whose sum is σ = 261072. Its totient is φ = 195792.

The previous prime is 228427. The next prime is 228443. The reversal of 228431 is 134822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134822 = 2 ⋅67411.

It is a cyclic number.

It is not a de Polignac number, because 228431 - 2² = 228427 is a prime.

It is a super-2 number, since 2×228431² = 104361443522, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 228431.

It is not an unprimeable number, because it can be changed into a prime (228421) 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, 16310 + ... + 16323.

It is an arithmetic number, because the mean of its divisors is an integer number (65268).

2²²⁸⁴³¹ is an apocalyptic number.

228431 is a deficient number, since it is larger than the sum of its proper divisors (32641).

228431 is an equidigital number, since it uses as much as digits as its factorization.

228431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32640.

The product of its digits is 384, while the sum is 20.

The square root of 228431 is about 477.9445574541. The cubic root of 228431 is about 61.1296177803.

The spelling of 228431 in words is "two hundred twenty-eight thousand, four hundred thirty-one".