229665861 has 24 divisors (see below), whose sum is σ = 344859424. Its totient is φ = 152740080.

The previous prime is 229665851. The next prime is 229665871. The reversal of 229665861 is 168566922.

229665861 is a `hidden beast` number, since 2 + 2 + 9 + 66 + 586 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (229665851) and next prime (229665871).

It is not a de Polignac number, because 229665861 - 2⁶ = 229665797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229665851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130590 + ... + 132336.

Almost surely, 2^229665861 is an apocalyptic number.

It is an amenable number.

229665861 is a deficient number, since it is larger than the sum of its proper divisors (115193563).

229665861 is an equidigital number, since it uses as much as digits as its factorization.

229665861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303 (or 2291 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 229665861 is about 15154.7306475569. The cubic root of 229665861 is about 612.3957215784.

The spelling of 229665861 in words is "two hundred twenty-nine million, six hundred sixty-five thousand, eight hundred sixty-one".