1643062501 has 2 divisors, whose sum is σ = 1643062502. Its totient is φ = 1643062500.

The previous prime is 1643062493. The next prime is 1643062517. The reversal of 1643062501 is 1052603461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1344982276 + 298080225 = 36674^2 + 17265^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643062501 - 2³ = 1643062493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1643062501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643066501) 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, 821531250 + 821531251.

It is an arithmetic number, because the mean of its divisors is an integer number (821531251).

Almost surely, 2^1643062501 is an apocalyptic number.

It is an amenable number.

1643062501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643062501 is an equidigital number, since it uses as much as digits as its factorization.

1643062501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1643062501 is about 40534.7073629501. The cubic root of 1643062501 is about 1180.0073017359.

Adding to 1643062501 its reverse (1052603461), we get a palindrome (2695665962).

The spelling of 1643062501 in words is "one billion, six hundred forty-three million, sixty-two thousand, five hundred one".