228111509 has 2 divisors, whose sum is σ = 228111510. Its totient is φ = 228111508.

The previous prime is 228111503. The next prime is 228111529. The reversal of 228111509 is 905111822.

228111509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224700100 + 3411409 = 14990^2 + 1847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228111509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228111503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114055754 + 114055755.

It is an arithmetic number, because the mean of its divisors is an integer number (114055755).

Almost surely, 2^228111509 is an apocalyptic number.

It is an amenable number.

228111509 is a deficient number, since it is larger than the sum of its proper divisors (1).

228111509 is an equidigital number, since it uses as much as digits as its factorization.

228111509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 228111509 is about 15103.3608511483. The cubic root of 228111509 is about 611.0110519509.

The spelling of 228111509 in words is "two hundred twenty-eight million, one hundred eleven thousand, five hundred nine".