1321861 has 4 divisors (see below), whose sum is σ = 1324224. Its totient is φ = 1319500.

The previous prime is 1321847. The next prime is 1321867. The reversal of 1321861 is 1681231.

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 a cyclic number.

It is not a de Polignac number, because 1321861 - 2⁹ = 1321349 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321867) 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, 186 + ... + 1636.

It is an arithmetic number, because the mean of its divisors is an integer number (331056).

2^1321861 is an apocalyptic number.

It is an amenable number.

1321861 is a deficient number, since it is larger than the sum of its proper divisors (2363).

1321861 is an equidigital number, since it uses as much as digits as its factorization.

1321861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2362.

The product of its digits is 288, while the sum is 22.

The square root of 1321861 is about 1149.7221403452. The cubic root of 1321861 is about 109.7476584823.

The spelling of 1321861 in words is "one million, three hundred twenty-one thousand, eight hundred sixty-one".