1316621 has 2 divisors, whose sum is σ = 1316622. Its totient is φ = 1316620.

The previous prime is 1316603. The next prime is 1316639. The reversal of 1316621 is 1266131.

It is a balanced prime because it is at equal distance from previous prime (1316603) and next prime (1316639).

It can be written as a sum of positive squares in only one way, i.e., 1240996 + 75625 = 1114^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 1316621 - 2¹⁰ = 1315597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1316593 and 1316602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1316671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658310 + 658311.

It is an arithmetic number, because the mean of its divisors is an integer number (658311).

2^1316621 is an apocalyptic number.

It is an amenable number.

1316621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1316621 is an equidigital number, since it uses as much as digits as its factorization.

1316621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 20.

The square root of 1316621 is about 1147.4410660247. The cubic root of 1316621 is about 109.6024492411.

The spelling of 1316621 in words is "one million, three hundred sixteen thousand, six hundred twenty-one".