228121757 has 2 divisors, whose sum is σ = 228121758. Its totient is φ = 228121756.

The previous prime is 228121741. The next prime is 228121769. The reversal of 228121757 is 757121822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227587396 + 534361 = 15086^2 + 731^2 .

It is a cyclic number.

It is not a de Polignac number, because 228121757 - 2⁴ = 228121741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228121727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114060878 + 114060879.

It is an arithmetic number, because the mean of its divisors is an integer number (114060879).

Almost surely, 2^228121757 is an apocalyptic number.

It is an amenable number.

228121757 is a deficient number, since it is larger than the sum of its proper divisors (1).

228121757 is an equidigital number, since it uses as much as digits as its factorization.

228121757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15680, while the sum is 35.

The square root of 228121757 is about 15103.7001095758. The cubic root of 228121757 is about 611.0202017852.

The spelling of 228121757 in words is "two hundred twenty-eight million, one hundred twenty-one thousand, seven hundred fifty-seven".