1521320413 has 2 divisors, whose sum is σ = 1521320414. Its totient is φ = 1521320412.

The previous prime is 1521320407. The next prime is 1521320417. The reversal of 1521320413 is 3140231251.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1288666404 + 232654009 = 35898^2 + 15253^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1521320413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1521320417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760660206 + 760660207.

It is an arithmetic number, because the mean of its divisors is an integer number (760660207).

Almost surely, 2^1521320413 is an apocalyptic number.

It is an amenable number.

1521320413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1521320413 is an equidigital number, since it uses as much as digits as its factorization.

1521320413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1521320413 is about 39004.1076426573. The cubic root of 1521320413 is about 1150.1122544486.

Adding to 1521320413 its reverse (3140231251), we get a palindrome (4661551664).

The spelling of 1521320413 in words is "one billion, five hundred twenty-one million, three hundred twenty thousand, four hundred thirteen".