228731137 has 2 divisors, whose sum is σ = 228731138. Its totient is φ = 228731136.

The previous prime is 228731131. The next prime is 228731171. The reversal of 228731137 is 731137822.

It is a happy number.

It is an a-pointer prime, because the next prime (228731171) can be obtained adding 228731137 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227376241 + 1354896 = 15079^2 + 1164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228731137 is a prime.

It is not a weakly prime, because it can be changed into another prime (228731131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114365568 + 114365569.

It is an arithmetic number, because the mean of its divisors is an integer number (114365569).

Almost surely, 2^228731137 is an apocalyptic number.

It is an amenable number.

228731137 is a deficient number, since it is larger than the sum of its proper divisors (1).

228731137 is an equidigital number, since it uses as much as digits as its factorization.

228731137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 34.

The square root of 228731137 is about 15123.8598578537. The cubic root of 228731137 is about 611.5637893273.

Adding to 228731137 its reverse (731137822), we get a palindrome (959868959).

The spelling of 228731137 in words is "two hundred twenty-eight million, seven hundred thirty-one thousand, one hundred thirty-seven".