231522165 has 32 divisors (see below), whose sum is σ = 470396160. Its totient is φ = 105838272.

The previous prime is 231522139. The next prime is 231522169. The reversal of 231522165 is 561225132.

It is a happy number.

It is not a de Polignac number, because 231522165 - 2¹⁸ = 231260021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231522169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121554 + ... + 123443.

It is an arithmetic number, because the mean of its divisors is an integer number (14699880).

Almost surely, 2^231522165 is an apocalyptic number.

It is an amenable number.

231522165 is an abundant number, since it is smaller than the sum of its proper divisors (238873995).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231522165 is a wasteful number, since it uses less digits than its factorization.

231522165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245018 (or 245012 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 231522165 is about 15215.8524243632. The cubic root of 231522165 is about 614.0412187136.

Adding to 231522165 its reverse (561225132), we get a palindrome (792747297).

The spelling of 231522165 in words is "two hundred thirty-one million, five hundred twenty-two thousand, one hundred sixty-five".