228358391 has 2 divisors, whose sum is σ = 228358392. Its totient is φ = 228358390.

The previous prime is 228358387. The next prime is 228358393. The reversal of 228358391 is 193853822.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 228358391 - 2² = 228358387 is a prime.

Together with 228358393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228358393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114179195 + 114179196.

It is an arithmetic number, because the mean of its divisors is an integer number (114179196).

Almost surely, 2^228358391 is an apocalyptic number.

228358391 is a deficient number, since it is larger than the sum of its proper divisors (1).

228358391 is an equidigital number, since it uses as much as digits as its factorization.

228358391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 228358391 is about 15111.5317224959. The cubic root of 228358391 is about 611.2314021410.

The spelling of 228358391 in words is "two hundred twenty-eight million, three hundred fifty-eight thousand, three hundred ninety-one".