229581 has 16 divisors (see below), whose sum is σ = 371520. Its totient is φ = 138960.

The previous prime is 229561. The next prime is 229583. The reversal of 229581 is 185922.

It is not a de Polignac number, because 229581 - 2⁵ = 229549 is a prime.

It is a super-2 number, since 2×229581² = 105414871122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90 + ... + 683.

It is an arithmetic number, because the mean of its divisors is an integer number (23220).

2²²⁹⁵⁸¹ is an apocalyptic number.

It is an amenable number.

229581 is a deficient number, since it is larger than the sum of its proper divisors (141939).

229581 is a wasteful number, since it uses less digits than its factorization.

With its successor (229582) it forms an eRAP, since the sums of their prime factors are consecutive (793 and 794).

229581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793 (or 787 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 229581 is about 479.1461155013. The cubic root of 229581 is about 61.2320286023.

The spelling of 229581 in words is "two hundred twenty-nine thousand, five hundred eighty-one".