1312161 has 4 divisors (see below), whose sum is σ = 1749552. Its totient is φ = 874772.

The previous prime is 1312153. The next prime is 1312169. The reversal of 1312161 is 1612131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1312153) and next prime (1312169).

It is a cyclic number.

It is not a de Polignac number, because 1312161 - 2³ = 1312153 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1312161.

It is not an unprimeable number, because it can be changed into a prime (1312169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218691 + ... + 218696.

It is an arithmetic number, because the mean of its divisors is an integer number (437388).

2^1312161 is an apocalyptic number.

It is an amenable number.

1312161 is a deficient number, since it is larger than the sum of its proper divisors (437391).

1312161 is an equidigital number, since it uses as much as digits as its factorization.

1312161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437390.

The product of its digits is 36, while the sum is 15.

The square root of 1312161 is about 1145.4959624547. The cubic root of 1312161 is about 109.4785512919.

Adding to 1312161 its reverse (1612131), we get a palindrome (2924292).

The spelling of 1312161 in words is "one million, three hundred twelve thousand, one hundred sixty-one".