228505331 has 2 divisors, whose sum is σ = 228505332. Its totient is φ = 228505330.

The previous prime is 228505327. The next prime is 228505339. The reversal of 228505331 is 133505822.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 228505331 - 2² = 228505327 is a prime.

It is a super-2 number, since 2×228505331² = 104429372590839122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 228505294 and 228505303.

It is not a weakly prime, because it can be changed into another prime (228505339) 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, 114252665 + 114252666.

It is an arithmetic number, because the mean of its divisors is an integer number (114252666).

Almost surely, 2^228505331 is an apocalyptic number.

228505331 is a deficient number, since it is larger than the sum of its proper divisors (1).

228505331 is an equidigital number, since it uses as much as digits as its factorization.

228505331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 228505331 is about 15116.3927906098. The cubic root of 228505331 is about 611.3624754722.

The spelling of 228505331 in words is "two hundred twenty-eight million, five hundred five thousand, three hundred thirty-one".