642734629 has 2 divisors, whose sum is σ = 642734630. Its totient is φ = 642734628.

The previous prime is 642734581. The next prime is 642734633. The reversal of 642734629 is 926437246.

642734629 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 575904004 + 66830625 = 23998^2 + 8175^2 .

It is a cyclic number.

It is not a de Polignac number, because 642734629 - 2¹¹ = 642732581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642734639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321367314 + 321367315.

It is an arithmetic number, because the mean of its divisors is an integer number (321367315).

Almost surely, 2^642734629 is an apocalyptic number.

It is an amenable number.

642734629 is a deficient number, since it is larger than the sum of its proper divisors (1).

642734629 is an equidigital number, since it uses as much as digits as its factorization.

642734629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 43.

The square root of 642734629 is about 25352.2115208910. The cubic root of 642734629 is about 862.9995443775. Note that the first 3 decimals are identical.

The spelling of 642734629 in words is "six hundred forty-two million, seven hundred thirty-four thousand, six hundred twenty-nine".