1297321 has 9 divisors (see below), whose sum is σ = 1398999.
Its totient is φ = 1202784.
The previous prime is 1297313. The next prime is 1297333. The reversal of 1297321 is 1237921.
Multipling 1297321 by its sum of digits (25), we get a square (32433025 = 56952).
The square root of 1297321 is 1139.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in only one way, i.e., 1010025 + 287296 = 1005^2 + 536^2
It is not a de Polignac number, because 1297321 - 23 = 1297313 is a prime.
It is a Duffinian number.
Its product of digits (756) is a multiple of the sum of its prime divisors (84).
1297321 is a lucky number.
It is not an unprimeable number, because it can be changed into a prime (1297421) by changing a digit.
It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 19330 + ... + 19396.
21297321 is an apocalyptic number.
1297321 is the 1139-th square number.
1297321 is the 570-th centered octagonal number.
It is an amenable number.
1297321 is a deficient number, since it is larger than the sum of its proper divisors (101678).
1297321 is an frugal number, since it uses more digits than its factorization.
1297321 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 168 (or 84 counting only the distinct ones).
The product of its digits is 756, while the sum is 25.
The cubic root of 1297321 is about 109.0642664525.
The spelling of 1297321 in words is "one million, two hundred ninety-seven thousand, three hundred twenty-one".