228556981 has 2 divisors, whose sum is σ = 228556982. Its totient is φ = 228556980.

The previous prime is 228556961. The next prime is 228556987. The reversal of 228556981 is 189655822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226954225 + 1602756 = 15065^2 + 1266^2 .

It is a cyclic number.

It is not a de Polignac number, because 228556981 - 2¹⁵ = 228524213 is a prime.

It is a super-2 number, since 2×228556981² = 104476587127668722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228556987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114278490 + 114278491.

It is an arithmetic number, because the mean of its divisors is an integer number (114278491).

Almost surely, 2^228556981 is an apocalyptic number.

It is an amenable number.

228556981 is a deficient number, since it is larger than the sum of its proper divisors (1).

228556981 is an equidigital number, since it uses as much as digits as its factorization.

228556981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345600, while the sum is 46.

The square root of 228556981 is about 15118.1011043054. The cubic root of 228556981 is about 611.4085349272.

The spelling of 228556981 in words is "two hundred twenty-eight million, five hundred fifty-six thousand, nine hundred eighty-one".