1321951 has 2 divisors, whose sum is σ = 1321952. Its totient is φ = 1321950.

The previous prime is 1321939. The next prime is 1321961. The reversal of 1321951 is 1591231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1321951 - 2⁵ = 1321919 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660975 + 660976.

It is an arithmetic number, because the mean of its divisors is an integer number (660976).

2^1321951 is an apocalyptic number.

1321951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321951 is an equidigital number, since it uses as much as digits as its factorization.

1321951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 22.

The square root of 1321951 is about 1149.7612795707. The cubic root of 1321951 is about 109.7501491792.

The spelling of 1321951 in words is "one million, three hundred twenty-one thousand, nine hundred fifty-one".