1261321 has 2 divisors, whose sum is σ = 1261322. Its totient is φ = 1261320.

The previous prime is 1261313. The next prime is 1261327. The reversal of 1261321 is 1231621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1071225 + 190096 = 1035^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261321 - 2³ = 1261313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1261295 and 1261304.

It is not a weakly prime, because it can be changed into another prime (1261327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630660 + 630661.

It is an arithmetic number, because the mean of its divisors is an integer number (630661).

2^1261321 is an apocalyptic number.

It is an amenable number.

1261321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261321 is an equidigital number, since it uses as much as digits as its factorization.

1261321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 16.

The square root of 1261321 is about 1123.0854820538. The cubic root of 1261321 is about 108.0459623754.

Adding to 1261321 its reverse (1231621), we get a palindrome (2492942).

The spelling of 1261321 in words is "one million, two hundred sixty-one thousand, three hundred twenty-one".