228155399 has 2 divisors, whose sum is σ = 228155400. Its totient is φ = 228155398.

The previous prime is 228155371. The next prime is 228155461. The reversal of 228155399 is 993551822.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 228155399 - 2²⁴ = 211378183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228155329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114077699 + 114077700.

It is an arithmetic number, because the mean of its divisors is an integer number (114077700).

Almost surely, 2^228155399 is an apocalyptic number.

228155399 is a deficient number, since it is larger than the sum of its proper divisors (1).

228155399 is an equidigital number, since it uses as much as digits as its factorization.

228155399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 44.

The square root of 228155399 is about 15104.8137691267. The cubic root of 228155399 is about 611.0502368148.

The spelling of 228155399 in words is "two hundred twenty-eight million, one hundred fifty-five thousand, three hundred ninety-nine".