228571391 has 4 divisors (see below), whose sum is σ = 228603384. Its totient is φ = 228539400.

The previous prime is 228571373. The next prime is 228571403. The reversal of 228571391 is 193175822.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 228571391 - 2¹⁴ = 228555007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228571361) 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, 161 + ... + 21381.

It is an arithmetic number, because the mean of its divisors is an integer number (57150846).

Almost surely, 2^228571391 is an apocalyptic number.

228571391 is a deficient number, since it is larger than the sum of its proper divisors (31993).

228571391 is a wasteful number, since it uses less digits than its factorization.

228571391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31992.

The product of its digits is 30240, while the sum is 38.

The square root of 228571391 is about 15118.5776778108. The cubic root of 228571391 is about 611.4213839650.

The spelling of 228571391 in words is "two hundred twenty-eight million, five hundred seventy-one thousand, three hundred ninety-one".