642019513 has 2 divisors, whose sum is σ = 642019514. Its totient is φ = 642019512.

The previous prime is 642019471. The next prime is 642019589. The reversal of 642019513 is 315910246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 341621289 + 300398224 = 18483^2 + 17332^2 .

It is a cyclic number.

It is not a de Polignac number, because 642019513 - 2¹⁷ = 641888441 is a prime.

It is not a weakly prime, because it can be changed into another prime (642019913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321009756 + 321009757.

It is an arithmetic number, because the mean of its divisors is an integer number (321009757).

Almost surely, 2^642019513 is an apocalyptic number.

It is an amenable number.

642019513 is a deficient number, since it is larger than the sum of its proper divisors (1).

642019513 is an equidigital number, since it uses as much as digits as its factorization.

642019513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 642019513 is about 25338.1039740546. The cubic root of 642019513 is about 862.6793636075.

Adding to 642019513 its reverse (315910246), we get a palindrome (957929759).

The spelling of 642019513 in words is "six hundred forty-two million, nineteen thousand, five hundred thirteen".