228138831 has 6 divisors (see below), whose sum is σ = 329533880. Its totient is φ = 152092548.

The previous prime is 228138811. The next prime is 228138847. The reversal of 228138831 is 138831822.

It is not a de Polignac number, because 228138831 - 2⁶ = 228138767 is a prime.

It is a super-2 number, since 2×228138831² = 104094652420093122, 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 (228138811) 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 5 ways as a sum of consecutive naturals, for example, 12674371 + ... + 12674388.

Almost surely, 2^228138831 is an apocalyptic number.

228138831 is a deficient number, since it is larger than the sum of its proper divisors (101395049).

228138831 is a wasteful number, since it uses less digits than its factorization.

228138831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25348765 (or 25348762 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 228138831 is about 15104.2653247353. The cubic root of 228138831 is about 611.0354455433.

The spelling of 228138831 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, eight hundred thirty-one".