228307213 has 2 divisors, whose sum is σ = 228307214. Its totient is φ = 228307212.

The previous prime is 228307181. The next prime is 228307231. The reversal of 228307213 is 312703822.

Together with next prime (228307231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136492489 + 91814724 = 11683^2 + 9582^2 .

It is a cyclic number.

It is not a de Polignac number, because 228307213 - 2⁵ = 228307181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228307283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114153606 + 114153607.

It is an arithmetic number, because the mean of its divisors is an integer number (114153607).

Almost surely, 2^228307213 is an apocalyptic number.

It is an amenable number.

228307213 is a deficient number, since it is larger than the sum of its proper divisors (1).

228307213 is an equidigital number, since it uses as much as digits as its factorization.

228307213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 228307213 is about 15109.8382850380. The cubic root of 228307213 is about 611.1857371701.

The spelling of 228307213 in words is "two hundred twenty-eight million, three hundred seven thousand, two hundred thirteen".