1300001321 has 2 divisors, whose sum is σ = 1300001322. Its totient is φ = 1300001320.

The previous prime is 1300001293. The next prime is 1300001323. The reversal of 1300001321 is 1231000031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1220524096 + 79477225 = 34936^2 + 8915^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1300001321 is a prime.

Together with 1300001323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1300001323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 650000660 + 650000661.

It is an arithmetic number, because the mean of its divisors is an integer number (650000661).

Almost surely, 2^1300001321 is an apocalyptic number.

It is an amenable number.

1300001321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1300001321 is an equidigital number, since it uses as much as digits as its factorization.

1300001321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 1300001321 is about 36055.5310736092. The cubic root of 1300001321 is about 1091.3932527353.

Adding to 1300001321 its reverse (1231000031), we get a palindrome (2531001352).

The spelling of 1300001321 in words is "one billion, three hundred million, one thousand, three hundred twenty-one".