228423131 has 2 divisors, whose sum is σ = 228423132. Its totient is φ = 228423130.

The previous prime is 228423119. The next prime is 228423133. The reversal of 228423131 is 131324822.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228423131 is a prime.

It is a super-2 number, since 2×228423131² = 104354253551686322, which contains 22 as substring.

Together with 228423133, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 228423131.

It is not a weakly prime, because it can be changed into another prime (228423133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114211565 + 114211566.

It is an arithmetic number, because the mean of its divisors is an integer number (114211566).

Almost surely, 2^228423131 is an apocalyptic number.

228423131 is a deficient number, since it is larger than the sum of its proper divisors (1).

228423131 is an equidigital number, since it uses as much as digits as its factorization.

228423131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 26.

The square root of 228423131 is about 15113.6736434263. The cubic root of 228423131 is about 611.2891584043.

Adding to 228423131 its reverse (131324822), we get a palindrome (359747953).

The spelling of 228423131 in words is "two hundred twenty-eight million, four hundred twenty-three thousand, one hundred thirty-one".