1321247 has 2 divisors, whose sum is σ = 1321248. Its totient is φ = 1321246.

The previous prime is 1321219. The next prime is 1321249. The reversal of 1321247 is 7421231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1321247 - 2¹⁸ = 1059103 is a prime.

Together with 1321249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321249) 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, 660623 + 660624.

It is an arithmetic number, because the mean of its divisors is an integer number (660624).

2^1321247 is an apocalyptic number.

1321247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321247 is an equidigital number, since it uses as much as digits as its factorization.

1321247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 20.

The square root of 1321247 is about 1149.4550882918. The cubic root of 1321247 is about 109.7306633776.

Adding to 1321247 its reverse (7421231), we get a palindrome (8742478).

The spelling of 1321247 in words is "one million, three hundred twenty-one thousand, two hundred forty-seven".