229669981 has 2 divisors, whose sum is σ = 229669982. Its totient is φ = 229669980.

The previous prime is 229669963. The next prime is 229669991. The reversal of 229669981 is 189966922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229037956 + 632025 = 15134^2 + 795^2 .

It is a cyclic number.

It is not a de Polignac number, because 229669981 - 2⁹ = 229669469 is a prime.

It is a super-2 number, since 2×229669981² = 105496600345080722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (229669991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114834990 + 114834991.

It is an arithmetic number, because the mean of its divisors is an integer number (114834991).

Almost surely, 2^229669981 is an apocalyptic number.

It is an amenable number.

229669981 is a deficient number, since it is larger than the sum of its proper divisors (1).

229669981 is an equidigital number, since it uses as much as digits as its factorization.

229669981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 52.

The square root of 229669981 is about 15154.8665780996. The cubic root of 229669981 is about 612.3993835002.

The spelling of 229669981 in words is "two hundred twenty-nine million, six hundred sixty-nine thousand, nine hundred eighty-one".