1642646513 has 2 divisors, whose sum is σ = 1642646514. Its totient is φ = 1642646512.

The previous prime is 1642646497. The next prime is 1642646531. The reversal of 1642646513 is 3156462461.

Together with next prime (1642646531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1605765184 + 36881329 = 40072^2 + 6073^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642646513 - 2⁴ = 1642646497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1642646113) 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, 821323256 + 821323257.

It is an arithmetic number, because the mean of its divisors is an integer number (821323257).

Almost surely, 2^1642646513 is an apocalyptic number.

It is an amenable number.

1642646513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642646513 is an equidigital number, since it uses as much as digits as its factorization.

1642646513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 38.

The square root of 1642646513 is about 40529.5757811502. The cubic root of 1642646513 is about 1179.9077091948.

The spelling of 1642646513 in words is "one billion, six hundred forty-two million, six hundred forty-six thousand, five hundred thirteen".