228217431 has 24 divisors (see below), whose sum is σ = 343840896. Its totient is φ = 134328480.

The previous prime is 228217427. The next prime is 228217433. The reversal of 228217431 is 134712822.

It is not a de Polignac number, because 228217431 - 2² = 228217427 is a prime.

It is a super-2 number, since 2×228217431² = 104166391624479522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228217433) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1876 + ... + 21446.

It is an arithmetic number, because the mean of its divisors is an integer number (14326704).

Almost surely, 2^228217431 is an apocalyptic number.

228217431 is a deficient number, since it is larger than the sum of its proper divisors (115623465).

228217431 is a wasteful number, since it uses less digits than its factorization.

228217431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19623 (or 19610 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 228217431 is about 15106.8670147056. The cubic root of 228217431 is about 611.1056102339.

The spelling of 228217431 in words is "two hundred twenty-eight million, two hundred seventeen thousand, four hundred thirty-one".