231135169 has 2 divisors, whose sum is σ = 231135170. Its totient is φ = 231135168.

The previous prime is 231135139. The next prime is 231135187. The reversal of 231135169 is 961531132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193766400 + 37368769 = 13920^2 + 6113^2 .

It is a cyclic number.

It is not a de Polignac number, because 231135169 - 2⁵ = 231135137 is a prime.

It is a super-2 number, since 2×231135169² = 106846932697317122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231135169.

It is not a weakly prime, because it can be changed into another prime (231135139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115567584 + 115567585.

It is an arithmetic number, because the mean of its divisors is an integer number (115567585).

Almost surely, 2^231135169 is an apocalyptic number.

It is an amenable number.

231135169 is a deficient number, since it is larger than the sum of its proper divisors (1).

231135169 is an equidigital number, since it uses as much as digits as its factorization.

231135169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 31.

The square root of 231135169 is about 15203.1302368953. The cubic root of 231135169 is about 613.6988986867.

It can be divided in two parts, 23113 and 5169, that added together give a palindrome (28282).

The spelling of 231135169 in words is "two hundred thirty-one million, one hundred thirty-five thousand, one hundred sixty-nine".