228977181 has 12 divisors (see below), whose sum is σ = 331055452. Its totient is φ = 152508096.

The previous prime is 228977179. The next prime is 228977183. The reversal of 228977181 is 181779822.

It is an interprime number because it is at equal distance from previous prime (228977179) and next prime (228977183).

It can be written as a sum of positive squares in 2 ways, for example, as 102212100 + 126765081 = 10110^2 + 11259^2 .

It is not a de Polignac number, because 228977181 - 2¹ = 228977179 is a prime.

It is a super-4 number, since 4×228977181⁴ (a number of 35 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228977183) 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, 1336 + ... + 21441.

Almost surely, 2^228977181 is an apocalyptic number.

It is an amenable number.

228977181 is a deficient number, since it is larger than the sum of its proper divisors (102078271).

228977181 is a wasteful number, since it uses less digits than its factorization.

228977181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23900 (or 23897 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 228977181 is about 15131.9919706561. The cubic root of 228977181 is about 611.7829952788.

The spelling of 228977181 in words is "two hundred twenty-eight million, nine hundred seventy-seven thousand, one hundred eighty-one".