1330621 has 2 divisors, whose sum is σ = 1330622. Its totient is φ = 1330620.

The previous prime is 1330603. The next prime is 1330633. The reversal of 1330621 is 1260331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 881721 + 448900 = 939^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1330621 - 2⁷ = 1330493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1330595 and 1330604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1330601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665310 + 665311.

It is an arithmetic number, because the mean of its divisors is an integer number (665311).

2^1330621 is an apocalyptic number.

It is an amenable number.

1330621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1330621 is an equidigital number, since it uses as much as digits as its factorization.

1330621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1330621 is about 1153.5254656920. The cubic root of 1330621 is about 109.9895582375.

Adding to 1330621 its reverse (1260331), we get a palindrome (2590952).

The spelling of 1330621 in words is "one million, three hundred thirty thousand, six hundred twenty-one".