228145469 has 2 divisors, whose sum is σ = 228145470. Its totient is φ = 228145468.

The previous prime is 228145459. The next prime is 228145471. The reversal of 228145469 is 964541822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220136569 + 8008900 = 14837^2 + 2830^2 .

It is a cyclic number.

It is not a de Polignac number, because 228145469 - 2¹² = 228141373 is a prime.

It is a super-2 number, since 2×228145469² = 104100710050459922, which contains 22 as substring.

Together with 228145471, 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 (228145409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114072734 + 114072735.

It is an arithmetic number, because the mean of its divisors is an integer number (114072735).

Almost surely, 2^228145469 is an apocalyptic number.

It is an amenable number.

228145469 is a deficient number, since it is larger than the sum of its proper divisors (1).

228145469 is an equidigital number, since it uses as much as digits as its factorization.

228145469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 41.

The square root of 228145469 is about 15104.4850623912. The cubic root of 228145469 is about 611.0413717797.

The spelling of 228145469 in words is "two hundred twenty-eight million, one hundred forty-five thousand, four hundred sixty-nine".