228139 has 2 divisors, whose sum is σ = 228140. Its totient is φ = 228138.

The previous prime is 228131. The next prime is 228181. The reversal of 228139 is 931822.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 228139 - 2³ = 228131 is a prime.

228139 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (228131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114069 + 114070.

It is an arithmetic number, because the mean of its divisors is an integer number (114070).

2²²⁸¹³⁹ is an apocalyptic number.

228139 is a deficient number, since it is larger than the sum of its proper divisors (1).

228139 is an equidigital number, since it uses as much as digits as its factorization.

228139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 228139 is about 477.6389850086. The cubic root of 228139 is about 61.1035596424.

It can be divided in two parts, 22813 and 9, that added together give a palindrome (22822).

The spelling of 228139 in words is "two hundred twenty-eight thousand, one hundred thirty-nine".