1331161 has 4 divisors (see below), whose sum is σ = 1433572. Its totient is φ = 1228752.

The previous prime is 1331153. The next prime is 1331207. The reversal of 1331161 is 1611331.

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 447561 + 883600 = 669^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331161 - 2³ = 1331153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51186 + ... + 51211.

It is an arithmetic number, because the mean of its divisors is an integer number (358393).

2^1331161 is an apocalyptic number.

It is an amenable number.

1331161 is a deficient number, since it is larger than the sum of its proper divisors (102411).

1331161 is a wasteful number, since it uses less digits than its factorization.

1331161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102410.

The product of its digits is 54, while the sum is 16.

The square root of 1331161 is about 1153.7595070031. The cubic root of 1331161 is about 110.0044350829.

Adding to 1331161 its reverse (1611331), we get a palindrome (2942492).

The spelling of 1331161 in words is "one million, three hundred thirty-one thousand, one hundred sixty-one".