228181277 has 4 divisors (see below), whose sum is σ = 233746716. Its totient is φ = 222615840.

The previous prime is 228181253. The next prime is 228181333. The reversal of 228181277 is 772181822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 772181822 = 2 ⋅386090911.

It can be written as a sum of positive squares in 2 ways, for example, as 93296281 + 134884996 = 9659^2 + 11614^2 .

It is a cyclic number.

It is not a de Polignac number, because 228181277 - 2²⁰ = 227132701 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 228181277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228184277) 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, 2782658 + ... + 2782739.

It is an arithmetic number, because the mean of its divisors is an integer number (58436679).

Almost surely, 2^228181277 is an apocalyptic number.

It is an amenable number.

228181277 is a deficient number, since it is larger than the sum of its proper divisors (5565439).

228181277 is an equidigital number, since it uses as much as digits as its factorization.

228181277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5565438.

The product of its digits is 25088, while the sum is 38.

The square root of 228181277 is about 15105.6703591731. The cubic root of 228181277 is about 611.0733382628.

The spelling of 228181277 in words is "two hundred twenty-eight million, one hundred eighty-one thousand, two hundred seventy-seven".