1321161 has 8 divisors (see below), whose sum is σ = 1771200. Its totient is φ = 875952.

The previous prime is 1321157. The next prime is 1321163. The reversal of 1321161 is 1611231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1321161 - 2² = 1321157 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321161.

It is not an unprimeable number, because it can be changed into a prime (1321163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510 + ... + 1703.

It is an arithmetic number, because the mean of its divisors is an integer number (221400).

2^1321161 is an apocalyptic number.

It is an amenable number.

1321161 is a deficient number, since it is larger than the sum of its proper divisors (450039).

1321161 is a wasteful number, since it uses less digits than its factorization.

1321161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2415.

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

The square root of 1321161 is about 1149.4176786530. The cubic root of 1321161 is about 109.7282825354.

Subtracting from 1321161 its product of digits (36), we obtain a triangular number (1321125 = T₁₆₂₅).

Adding to 1321161 its reverse (1611231), we get a palindrome (2932392).

The spelling of 1321161 in words is "one million, three hundred twenty-one thousand, one hundred sixty-one".