229911981 has 8 divisors (see below), whose sum is σ = 330130080. Its totient is φ = 141484272.

The previous prime is 229911973. The next prime is 229912003. The reversal of 229911981 is 189119922.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 229911981 - 2³ = 229911973 is a prime.

It is a super-2 number, since 2×229911981² = 105719038014688722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229911901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2947551 + ... + 2947628.

It is an arithmetic number, because the mean of its divisors is an integer number (41266260).

Almost surely, 2^229911981 is an apocalyptic number.

It is an amenable number.

229911981 is a deficient number, since it is larger than the sum of its proper divisors (100218099).

229911981 is a wasteful number, since it uses less digits than its factorization.

229911981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5895195.

The product of its digits is 23328, while the sum is 42.

The square root of 229911981 is about 15162.8487099226. The cubic root of 229911981 is about 612.6144001781.

The spelling of 229911981 in words is "two hundred twenty-nine million, nine hundred eleven thousand, nine hundred eighty-one".