642361 has 2 divisors, whose sum is σ = 642362. Its totient is φ = 642360.

The previous prime is 642359. The next prime is 642373. The reversal of 642361 is 163246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 609961 + 32400 = 781^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 642361 - 2¹ = 642359 is a prime.

Together with 642359, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (649361) 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, 321180 + 321181.

It is an arithmetic number, because the mean of its divisors is an integer number (321181).

2⁶⁴²³⁶¹ is an apocalyptic number.

It is an amenable number.

642361 is a deficient number, since it is larger than the sum of its proper divisors (1).

642361 is an equidigital number, since it uses as much as digits as its factorization.

642361 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 642361 is about 801.4742665863. The cubic root of 642361 is about 86.2832288125.

The spelling of 642361 in words is "six hundred forty-two thousand, three hundred sixty-one".