228137831 has 4 divisors (see below), whose sum is σ = 228199992. Its totient is φ = 228075672.

The previous prime is 228137821. The next prime is 228137857. The reversal of 228137831 is 138731822.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 228137831 - 2¹⁰ = 228136807 is a prime.

It is a super-2 number, since 2×228137831² = 104093739866769122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 228137791 and 228137800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228137821) 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, 25205 + ... + 33038.

It is an arithmetic number, because the mean of its divisors is an integer number (57049998).

Almost surely, 2^228137831 is an apocalyptic number.

228137831 is a deficient number, since it is larger than the sum of its proper divisors (62161).

228137831 is an equidigital number, since it uses as much as digits as its factorization.

228137831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62160.

The product of its digits is 16128, while the sum is 35.

The square root of 228137831 is about 15104.2322214669. The cubic root of 228137831 is about 611.0345527589.

The spelling of 228137831 in words is "two hundred twenty-eight million, one hundred thirty-seven thousand, eight hundred thirty-one".