229355981 has 2 divisors, whose sum is σ = 229355982. Its totient is φ = 229355980.

The previous prime is 229355953. The next prime is 229356013. The reversal of 229355981 is 189553922.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184009225 + 45346756 = 13565^2 + 6734^2 .

It is a cyclic number.

It is not a de Polignac number, because 229355981 - 2²⁶ = 162247117 is a prime.

It is a super-2 number, since 2×229355981² = 105208332040944722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (229355921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114677990 + 114677991.

It is an arithmetic number, because the mean of its divisors is an integer number (114677991).

Almost surely, 2^229355981 is an apocalyptic number.

It is an amenable number.

229355981 is a deficient number, since it is larger than the sum of its proper divisors (1).

229355981 is an equidigital number, since it uses as much as digits as its factorization.

229355981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 44.

The square root of 229355981 is about 15144.5033262897. The cubic root of 229355981 is about 612.1201696686.

The spelling of 229355981 in words is "two hundred twenty-nine million, three hundred fifty-five thousand, nine hundred eighty-one".