228531681 has 24 divisors (see below), whose sum is σ = 383449664. Its totient is φ = 128446560.

The previous prime is 228531671. The next prime is 228531701. The reversal of 228531681 is 186135822.

It is a happy number.

It is not a de Polignac number, because 228531681 - 2⁶ = 228531617 is a prime.

It is a super-2 number, since 2×228531681² = 104453458441371522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228531631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25891 + ... + 33576.

Almost surely, 2^228531681 is an apocalyptic number.

228531681 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

228531681 is a deficient number, since it is larger than the sum of its proper divisors (154917983).

228531681 is a wasteful number, since it uses less digits than its factorization.

228531681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59541 (or 59538 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 228531681 is about 15117.2643358512. The cubic root of 228531681 is about 611.3859742414.

The spelling of 228531681 in words is "two hundred twenty-eight million, five hundred thirty-one thousand, six hundred eighty-one".