1312921 has 2 divisors, whose sum is σ = 1312922. Its totient is φ = 1312920.

The previous prime is 1312907. The next prime is 1312931. The reversal of 1312921 is 1292131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1243225 + 69696 = 1115^2 + 264^2 .

It is an emirp because it is prime and its reverse (1292131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1312921 - 2⁵ = 1312889 is a prime.

It is a Chen prime.

1312921 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1312931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656460 + 656461.

It is an arithmetic number, because the mean of its divisors is an integer number (656461).

2^1312921 is an apocalyptic number.

It is an amenable number.

1312921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312921 is an equidigital number, since it uses as much as digits as its factorization.

1312921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 19.

The square root of 1312921 is about 1145.8276484707. The cubic root of 1312921 is about 109.4996837699.

The spelling of 1312921 in words is "one million, three hundred twelve thousand, nine hundred twenty-one".