1281321 has 6 divisors (see below), whose sum is σ = 1850810. Its totient is φ = 854208.

The previous prime is 1281317. The next prime is 1281331. The reversal of 1281321 is 1231821.

It can be written as a sum of positive squares in only one way, i.e., 1166400 + 114921 = 1080^2 + 339^2 .

It is not a de Polignac number, because 1281321 - 2² = 1281317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1281294 and 1281303.

It is not an unprimeable number, because it can be changed into a prime (1281331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71176 + ... + 71193.

2^1281321 is an apocalyptic number.

It is an amenable number.

1281321 is a deficient number, since it is larger than the sum of its proper divisors (569489).

1281321 is a wasteful number, since it uses less digits than its factorization.

1281321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142375 (or 142372 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1281321 is about 1131.9545043861. The cubic root of 1281321 is about 108.6140433393.

The spelling of 1281321 in words is "one million, two hundred eighty-one thousand, three hundred twenty-one".