228605531 has 12 divisors (see below), whose sum is σ = 290104920. Its totient is φ = 178133760.

The previous prime is 228605527. The next prime is 228605543. The reversal of 228605531 is 135506822.

It is not a de Polignac number, because 228605531 - 2² = 228605527 is a prime.

It is a super-2 number, since 2×228605531² = 104520977607583922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (228605561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211526 + ... + 212603.

It is an arithmetic number, because the mean of its divisors is an integer number (24175410).

Almost surely, 2^228605531 is an apocalyptic number.

228605531 is a deficient number, since it is larger than the sum of its proper divisors (61499389).

228605531 is a wasteful number, since it uses less digits than its factorization.

228605531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424154 (or 424147 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 228605531 is about 15119.7067101184. The cubic root of 228605531 is about 611.4518235967.

The spelling of 228605531 in words is "two hundred twenty-eight million, six hundred five thousand, five hundred thirty-one".