228338491 has 2 divisors, whose sum is σ = 228338492. Its totient is φ = 228338490.

The previous prime is 228338483. The next prime is 228338527. The reversal of 228338491 is 194833822.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 228338491 - 2³ = 228338483 is a prime.

It is not a weakly prime, because it can be changed into another prime (228330491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114169245 + 114169246.

It is an arithmetic number, because the mean of its divisors is an integer number (114169246).

Almost surely, 2^228338491 is an apocalyptic number.

228338491 is a deficient number, since it is larger than the sum of its proper divisors (1).

228338491 is an equidigital number, since it uses as much as digits as its factorization.

228338491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 228338491 is about 15110.8732705956. The cubic root of 228338491 is about 611.2136466322.

The spelling of 228338491 in words is "two hundred twenty-eight million, three hundred thirty-eight thousand, four hundred ninety-one".