1321139 has 2 divisors, whose sum is σ = 1321140. Its totient is φ = 1321138.

The previous prime is 1321109. The next prime is 1321141. The reversal of 1321139 is 9311231.

It is a strong prime.

It is an emirp because it is prime and its reverse (9311231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321139 - 2²⁰ = 272563 is a prime.

Together with 1321141, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321139.

It is not a weakly prime, because it can be changed into another prime (1321109) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660569 + 660570.

It is an arithmetic number, because the mean of its divisors is an integer number (660570).

2^1321139 is an apocalyptic number.

1321139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321139 is an equidigital number, since it uses as much as digits as its factorization.

1321139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162, while the sum is 20.

The square root of 1321139 is about 1149.4081085498. The cubic root of 1321139 is about 109.7276734662.

The spelling of 1321139 in words is "one million, three hundred twenty-one thousand, one hundred thirty-nine".