642613 has 2 divisors, whose sum is σ = 642614. Its totient is φ = 642612.

The previous prime is 642581. The next prime is 642623. The reversal of 642613 is 316246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544644 + 97969 = 738^2 + 313^2 .

It is a cyclic number.

It is not a de Polignac number, because 642613 - 2⁵ = 642581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642623) 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, 321306 + 321307.

It is an arithmetic number, because the mean of its divisors is an integer number (321307).

2⁶⁴²⁶¹³ is an apocalyptic number.

It is an amenable number.

642613 is a deficient number, since it is larger than the sum of its proper divisors (1).

642613 is an equidigital number, since it uses as much as digits as its factorization.

642613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 22.

The square root of 642613 is about 801.6314614584. The cubic root of 642613 is about 86.2945103872.

Adding to 642613 its reverse (316246), we get a palindrome (958859).

It can be divided in two parts, 6426 and 13, that multiplied together give a palindrome (83538).

The spelling of 642613 in words is "six hundred forty-two thousand, six hundred thirteen".