1231165 has 24 divisors (see below), whose sum is σ = 1686528. Its totient is φ = 861120.

The previous prime is 1231141. The next prime is 1231171. The reversal of 1231165 is 5611321.

It is not a de Polignac number, because 1231165 - 2¹⁵ = 1198397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26172 + ... + 26218.

It is an arithmetic number, because the mean of its divisors is an integer number (70272).

2^1231165 is an apocalyptic number.

It is an amenable number.

1231165 is a deficient number, since it is larger than the sum of its proper divisors (455363).

1231165 is a wasteful number, since it uses less digits than its factorization.

1231165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 96 counting only the distinct ones).

The product of its digits is 180, while the sum is 19.

The square root of 1231165 is about 1109.5787488953. The cubic root of 1231165 is about 107.1779436411.

Adding to 1231165 its reverse (5611321), we get a palindrome (6842486).

The spelling of 1231165 in words is "one million, two hundred thirty-one thousand, one hundred sixty-five".