1391321 has 4 divisors (see below), whose sum is σ = 1404432. Its totient is φ = 1378212.

The previous prime is 1391317. The next prime is 1391323. The reversal of 1391321 is 1231931.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1231931 = 1097 ⋅1123.

It is a cyclic number.

It is not a de Polignac number, because 1391321 - 2² = 1391317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1391293 and 1391302.

It is not an unprimeable number, because it can be changed into a prime (1391323) 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, 6395 + ... + 6608.

It is an arithmetic number, because the mean of its divisors is an integer number (351108).

2^1391321 is an apocalyptic number.

It is an amenable number.

1391321 is a deficient number, since it is larger than the sum of its proper divisors (13111).

1391321 is a wasteful number, since it uses less digits than its factorization.

1391321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13110.

The product of its digits is 162, while the sum is 20.

The square root of 1391321 is about 1179.5427080017. The cubic root of 1391321 is about 111.6372457825.

The spelling of 1391321 in words is "one million, three hundred ninety-one thousand, three hundred twenty-one".