642953159 has 2 divisors, whose sum is σ = 642953160. Its totient is φ = 642953158.

The previous prime is 642953153. The next prime is 642953161. The reversal of 642953159 is 951359246.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642953159 is a prime.

Together with 642953161, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642953153) 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, 321476579 + 321476580.

It is an arithmetic number, because the mean of its divisors is an integer number (321476580).

Almost surely, 2^642953159 is an apocalyptic number.

642953159 is a deficient number, since it is larger than the sum of its proper divisors (1).

642953159 is an equidigital number, since it uses as much as digits as its factorization.

642953159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 291600, while the sum is 44.

The square root of 642953159 is about 25356.5210350316. The cubic root of 642953159 is about 863.0973400111.

The spelling of 642953159 in words is "six hundred forty-two million, nine hundred fifty-three thousand, one hundred fifty-nine".