228932909 has 2 divisors, whose sum is σ = 228932910. Its totient is φ = 228932908.

The previous prime is 228932797. The next prime is 228932947. The reversal of 228932909 is 909239822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201924100 + 27008809 = 14210^2 + 5197^2 .

It is a cyclic number.

It is not a de Polignac number, because 228932909 - 2²⁰ = 227884333 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 228932909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228937909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114466454 + 114466455.

It is an arithmetic number, because the mean of its divisors is an integer number (114466455).

Almost surely, 2^228932909 is an apocalyptic number.

It is an amenable number.

228932909 is a deficient number, since it is larger than the sum of its proper divisors (1).

228932909 is an equidigital number, since it uses as much as digits as its factorization.

228932909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 228932909 is about 15130.5290389993. The cubic root of 228932909 is about 611.7435639805.

The spelling of 228932909 in words is "two hundred twenty-eight million, nine hundred thirty-two thousand, nine hundred nine".