642623159 has 2 divisors, whose sum is σ = 642623160. Its totient is φ = 642623158.

The previous prime is 642623131. The next prime is 642623167. The reversal of 642623159 is 951326246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642623159 - 2²⁴ = 625845943 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642620159) 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, 321311579 + 321311580.

It is an arithmetic number, because the mean of its divisors is an integer number (321311580).

Almost surely, 2^642623159 is an apocalyptic number.

642623159 is a deficient number, since it is larger than the sum of its proper divisors (1).

642623159 is an equidigital number, since it uses as much as digits as its factorization.

642623159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 38.

The square root of 642623159 is about 25350.0129980243. The cubic root of 642623159 is about 862.9496512507.

The spelling of 642623159 in words is "six hundred forty-two million, six hundred twenty-three thousand, one hundred fifty-nine".