1313621 has 2 divisors, whose sum is σ = 1313622. Its totient is φ = 1313620.

The previous prime is 1313597. The next prime is 1313623. The reversal of 1313621 is 1263131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 970225 + 343396 = 985^2 + 586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1313621 is a prime.

It is a Sophie Germain prime.

Together with 1313623, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1313621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656810 + 656811.

It is an arithmetic number, because the mean of its divisors is an integer number (656811).

2^1313621 is an apocalyptic number.

It is an amenable number.

1313621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313621 is an equidigital number, since it uses as much as digits as its factorization.

1313621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 17.

The square root of 1313621 is about 1146.1330638281. The cubic root of 1313621 is about 109.5191406807.

Adding to 1313621 its reverse (1263131), we get a palindrome (2576752).

The spelling of 1313621 in words is "one million, three hundred thirteen thousand, six hundred twenty-one".