228145157 has 4 divisors (see below), whose sum is σ = 228209100. Its totient is φ = 228081216.

The previous prime is 228145123. The next prime is 228145187. The reversal of 228145157 is 751541822.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53085796 + 175059361 = 7286^2 + 13231^2 .

It is a cyclic number.

It is not a de Polignac number, because 228145157 - 2¹⁴ = 228128773 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 (228145187) 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, 26282 + ... + 33867.

It is an arithmetic number, because the mean of its divisors is an integer number (57052275).

Almost surely, 2^228145157 is an apocalyptic number.

It is an amenable number.

228145157 is a deficient number, since it is larger than the sum of its proper divisors (63943).

228145157 is an equidigital number, since it uses as much as digits as its factorization.

228145157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63942.

The product of its digits is 22400, while the sum is 35.

The square root of 228145157 is about 15104.4747343296. The cubic root of 228145157 is about 611.0410932367.

Adding to 228145157 its reverse (751541822), we get a palindrome (979686979).

The spelling of 228145157 in words is "two hundred twenty-eight million, one hundred forty-five thousand, one hundred fifty-seven".