228138629 has 2 divisors, whose sum is σ = 228138630. Its totient is φ = 228138628.

The previous prime is 228138619. The next prime is 228138653. The reversal of 228138629 is 926831822.

228138629 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., 184552225 + 43586404 = 13585^2 + 6602^2 .

It is a cyclic number.

It is not a de Polignac number, because 228138629 - 2²⁴ = 211361413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228138619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114069314 + 114069315.

It is an arithmetic number, because the mean of its divisors is an integer number (114069315).

Almost surely, 2^228138629 is an apocalyptic number.

It is an amenable number.

228138629 is a deficient number, since it is larger than the sum of its proper divisors (1).

228138629 is an equidigital number, since it uses as much as digits as its factorization.

228138629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 41.

The square root of 228138629 is about 15104.2586378809. The cubic root of 228138629 is about 611.0352652011.

The spelling of 228138629 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, six hundred twenty-nine".