131222165 has 16 divisors (see below), whose sum is σ = 162108912. Its totient is φ = 101896704.

The previous prime is 131222159. The next prime is 131222173. The reversal of 131222165 is 561222131.

It can be written as a sum of positive squares in 8 ways, for example, as 485809 + 130736356 = 697^2 + 11434^2 .

It is a cyclic number.

It is not a de Polignac number, because 131222165 - 2¹⁸ = 130960021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131222165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139577 + ... + 140513.

It is an arithmetic number, because the mean of its divisors is an integer number (10131807).

Almost surely, 2^131222165 is an apocalyptic number.

It is an amenable number.

131222165 is a deficient number, since it is larger than the sum of its proper divisors (30886747).

131222165 is an equidigital number, since it uses as much as digits as its factorization.

131222165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736.

The product of its digits is 720, while the sum is 23.

The square root of 131222165 is about 11455.2243539793. The cubic root of 131222165 is about 508.1622502896.

Adding to 131222165 its reverse (561222131), we get a palindrome (692444296).

The spelling of 131222165 in words is "one hundred thirty-one million, two hundred twenty-two thousand, one hundred sixty-five".