1620324413 has 2 divisors, whose sum is σ = 1620324414. Its totient is φ = 1620324412.

The previous prime is 1620324403. The next prime is 1620324421. The reversal of 1620324413 is 3144230261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 978563524 + 641760889 = 31282^2 + 25333^2 .

It is an emirp because it is prime and its reverse (3144230261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1620324413 - 2⁴ = 1620324397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620324403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810162206 + 810162207.

It is an arithmetic number, because the mean of its divisors is an integer number (810162207).

Almost surely, 2^1620324413 is an apocalyptic number.

It is an amenable number.

1620324413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620324413 is an equidigital number, since it uses as much as digits as its factorization.

1620324413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 1620324413 is about 40253.2534461502. The cubic root of 1620324413 is about 1174.5386842759.

Adding to 1620324413 its reverse (3144230261), we get a palindrome (4764554674).

The spelling of 1620324413 in words is "one billion, six hundred twenty million, three hundred twenty-four thousand, four hundred thirteen".