228987161 has 16 divisors (see below), whose sum is σ = 270118800. Its totient is φ = 192073728.

The previous prime is 228987151. The next prime is 228987193. The reversal of 228987161 is 161789822.

It can be written as a sum of positive squares in 8 ways, for example, as 31416025 + 197571136 = 5605^2 + 14056^2 .

It is not a de Polignac number, because 228987161 - 2¹⁸ = 228725017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (228987131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11456 + ... + 24273.

It is an arithmetic number, because the mean of its divisors is an integer number (16882425).

Almost surely, 2^228987161 is an apocalyptic number.

It is an amenable number.

228987161 is a deficient number, since it is larger than the sum of its proper divisors (41131639).

228987161 is a wasteful number, since it uses less digits than its factorization.

228987161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35788.

The product of its digits is 96768, while the sum is 44.

The square root of 228987161 is about 15132.3217319749. The cubic root of 228987161 is about 611.7918833632.

The spelling of 228987161 in words is "two hundred twenty-eight million, nine hundred eighty-seven thousand, one hundred sixty-one".