228705293 has 2 divisors, whose sum is σ = 228705294. Its totient is φ = 228705292.

The previous prime is 228705289. The next prime is 228705317. The reversal of 228705293 is 392507822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226863844 + 1841449 = 15062^2 + 1357^2 .

It is a cyclic number.

It is not a de Polignac number, because 228705293 - 2² = 228705289 is a prime.

It is a super-2 number, since 2×228705293² = 104612222092431698, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228705263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114352646 + 114352647.

It is an arithmetic number, because the mean of its divisors is an integer number (114352647).

Almost surely, 2^228705293 is an apocalyptic number.

It is an amenable number.

228705293 is a deficient number, since it is larger than the sum of its proper divisors (1).

228705293 is an equidigital number, since it uses as much as digits as its factorization.

228705293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 228705293 is about 15123.0054222036. The cubic root of 228705293 is about 611.5407552240.

The spelling of 228705293 in words is "two hundred twenty-eight million, seven hundred five thousand, two hundred ninety-three".