228918861 has 6 divisors (see below), whose sum is σ = 330660590. Its totient is φ = 152612568.

The previous prime is 228918817. The next prime is 228918871. The reversal of 228918861 is 168819822.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 123343236 + 105575625 = 11106^2 + 10275^2 .

It is not a de Polignac number, because 228918861 - 2⁶ = 228918797 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 (228918871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12717706 + ... + 12717723.

Almost surely, 2^228918861 is an apocalyptic number.

It is an amenable number.

228918861 is a deficient number, since it is larger than the sum of its proper divisors (101741729).

228918861 is a wasteful number, since it uses less digits than its factorization.

228918861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25435435 (or 25435432 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The square root of 228918861 is about 15130.0648048843. The cubic root of 228918861 is about 611.7310509268.

The spelling of 228918861 in words is "two hundred twenty-eight million, nine hundred eighteen thousand, eight hundred sixty-one".