229825781 has 4 divisors (see below), whose sum is σ = 230104512. Its totient is φ = 229547052.

The previous prime is 229825777. The next prime is 229825789. The reversal of 229825781 is 187528922.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 229825781 - 2² = 229825777 is a prime.

It is a super-2 number, since 2×229825781² = 105639779224519922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229825789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138125 + ... + 139778.

It is an arithmetic number, because the mean of its divisors is an integer number (57526128).

Almost surely, 2^229825781 is an apocalyptic number.

It is an amenable number.

229825781 is a deficient number, since it is larger than the sum of its proper divisors (278731).

229825781 is an equidigital number, since it uses as much as digits as its factorization.

229825781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278730.

The product of its digits is 161280, while the sum is 44.

The square root of 229825781 is about 15160.0059696558. The cubic root of 229825781 is about 612.5378289006.

The spelling of 229825781 in words is "two hundred twenty-nine million, eight hundred twenty-five thousand, seven hundred eighty-one".