228212131 has 8 divisors (see below), whose sum is σ = 276156000. Its totient is φ = 184103808.

The previous prime is 228212129. The next prime is 228212143. The reversal of 228212131 is 131212822.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 228212131 - 2¹ = 228212129 is a prime.

It is a super-2 number, since 2×228212131² = 104161553471122322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228210131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 958756 + ... + 958993.

It is an arithmetic number, because the mean of its divisors is an integer number (34519500).

Almost surely, 2^228212131 is an apocalyptic number.

228212131 is a deficient number, since it is larger than the sum of its proper divisors (47943869).

228212131 is a wasteful number, since it uses less digits than its factorization.

228212131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917773.

The product of its digits is 384, while the sum is 22.

The square root of 228212131 is about 15106.6915967726. The cubic root of 228212131 is about 611.1008795336.

Adding to 228212131 its reverse (131212822), we get a palindrome (359424953).

The spelling of 228212131 in words is "two hundred twenty-eight million, two hundred twelve thousand, one hundred thirty-one".