2131165 has 4 divisors (see below), whose sum is σ = 2557404. Its totient is φ = 1704928.

The previous prime is 2131141. The next prime is 2131193. The reversal of 2131165 is 5611312.

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 311364 + 1819801 = 558^2 + 1349^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131165 - 2⁵ = 2131133 is a prime.

It is a Duffinian number.

2131165 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213112 + ... + 213121.

It is an arithmetic number, because the mean of its divisors is an integer number (639351).

2^2131165 is an apocalyptic number.

It is an amenable number.

2131165 is a deficient number, since it is larger than the sum of its proper divisors (426239).

2131165 is an equidigital number, since it uses as much as digits as its factorization.

2131165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426238.

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

The square root of 2131165 is about 1459.8510197962. The cubic root of 2131165 is about 128.6882885203.

Adding to 2131165 its reverse (5611312), we get a palindrome (7742477).

It can be divided in two parts, 213 and 1165, that added together give a triangular number (1378 = T₅₂).

The spelling of 2131165 in words is "two million, one hundred thirty-one thousand, one hundred sixty-five".