Search a number
-
+
642997 is a prime number
BaseRepresentation
bin10011100111110110101
31012200000201
42130332311
5131033442
621440501
75315425
oct2347665
91180021
10642997
113aa103
12270131
13196894
1412a485
15ca7b7
hex9cfb5

642997 has 2 divisors, whose sum is σ = 642998. Its totient is φ = 642996.

The previous prime is 642977. The next prime is 643009. The reversal of 642997 is 799246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 531441 + 111556 = 729^2 + 334^2 .

It is a cyclic number.

It is not a de Polignac number, because 642997 - 27 = 642869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642907) 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, 321498 + 321499.

It is an arithmetic number, because the mean of its divisors is an integer number (321499).

2642997 is an apocalyptic number.

It is an amenable number.

642997 is a deficient number, since it is larger than the sum of its proper divisors (1).

642997 is an equidigital number, since it uses as much as digits as its factorization.

642997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 642997 is about 801.8709372461. The cubic root of 642997 is about 86.3116956884.

The spelling of 642997 in words is "six hundred forty-two thousand, nine hundred ninety-seven".