1645789213 has 2 divisors, whose sum is σ = 1645789214. Its totient is φ = 1645789212.

The previous prime is 1645789199. The next prime is 1645789319. The reversal of 1645789213 is 3129875461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1435045924 + 210743289 = 37882^2 + 14517^2 .

It is an emirp because it is prime and its reverse (3129875461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1645789213 - 2²⁹ = 1108918301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645789813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822894606 + 822894607.

It is an arithmetic number, because the mean of its divisors is an integer number (822894607).

Almost surely, 2^1645789213 is an apocalyptic number.

It is an amenable number.

1645789213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645789213 is an equidigital number, since it uses as much as digits as its factorization.

1645789213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 46.

The square root of 1645789213 is about 40568.3277077081. The cubic root of 1645789213 is about 1180.6596936034.

The spelling of 1645789213 in words is "one billion, six hundred forty-five million, seven hundred eighty-nine thousand, two hundred thirteen".