228812149 has 4 divisors (see below), whose sum is σ = 231946636. Its totient is φ = 225677664.

The previous prime is 228812137. The next prime is 228812179. The reversal of 228812149 is 941218822.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 941218822 = 2 ⋅470609411.

It can be written as a sum of positive squares in 2 ways, for example, as 185449924 + 43362225 = 13618^2 + 6585^2 .

It is a cyclic number.

It is not a de Polignac number, because 228812149 - 2¹³ = 228803957 is a prime.

It is a super-4 number, since 4×228812149⁴ (a number of 35 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228812179) 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, 1567134 + ... + 1567279.

It is an arithmetic number, because the mean of its divisors is an integer number (57986659).

Almost surely, 2^228812149 is an apocalyptic number.

It is an amenable number.

228812149 is a deficient number, since it is larger than the sum of its proper divisors (3134487).

228812149 is an equidigital number, since it uses as much as digits as its factorization.

228812149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3134486.

The product of its digits is 18432, while the sum is 37.

The square root of 228812149 is about 15126.5379052842. The cubic root of 228812149 is about 611.6359820311.

The spelling of 228812149 in words is "two hundred twenty-eight million, eight hundred twelve thousand, one hundred forty-nine".