1643045513 has 2 divisors, whose sum is σ = 1643045514. Its totient is φ = 1643045512.

The previous prime is 1643045483. The next prime is 1643045519. The reversal of 1643045513 is 3155403461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1158517369 + 484528144 = 34037^2 + 22012^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643045513 - 2⁶ = 1643045449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1643045513.

It is not a weakly prime, because it can be changed into another prime (1643045519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821522756 + 821522757.

It is an arithmetic number, because the mean of its divisors is an integer number (821522757).

Almost surely, 2^1643045513 is an apocalyptic number.

It is an amenable number.

1643045513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643045513 is an equidigital number, since it uses as much as digits as its factorization.

1643045513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 1643045513 is about 40534.4978135908. The cubic root of 1643045513 is about 1180.0032349332.

Adding to 1643045513 its reverse (3155403461), we get a palindrome (4798448974).

The spelling of 1643045513 in words is "one billion, six hundred forty-three million, forty-five thousand, five hundred thirteen".