228381691 has 6 divisors (see below), whose sum is σ = 240471140. Its totient is φ = 216299196.

The previous prime is 228381679. The next prime is 228381709. The reversal of 228381691 is 196183822.

It is not a de Polignac number, because 228381691 - 2⁷ = 228381563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228381631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64140 + ... + 67606.

Almost surely, 2^228381691 is an apocalyptic number.

228381691 is a deficient number, since it is larger than the sum of its proper divisors (12089449).

228381691 is an frugal number, since it uses more digits than its factorization.

228381691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6953 (or 3486 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 228381691 is about 15112.3026372555. The cubic root of 228381691 is about 611.2521899434.

The spelling of 228381691 in words is "two hundred twenty-eight million, three hundred eighty-one thousand, six hundred ninety-one".