642443351 has 16 divisors (see below), whose sum is σ = 729129600. Its totient is φ = 560700000.

The previous prime is 642443341. The next prime is 642443353. The reversal of 642443351 is 153344246.

642443351 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642443351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642443353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51476 + ... + 62726.

It is an arithmetic number, because the mean of its divisors is an integer number (45570600).

Almost surely, 2^642443351 is an apocalyptic number.

642443351 is a deficient number, since it is larger than the sum of its proper divisors (86686249).

642443351 is a wasteful number, since it uses less digits than its factorization.

642443351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11470.

The product of its digits is 34560, while the sum is 32.

The square root of 642443351 is about 25346.4662428513. The cubic root of 642443351 is about 862.8691583922.

Adding to 642443351 its reverse (153344246), we get a palindrome (795787597).

The spelling of 642443351 in words is "six hundred forty-two million, four hundred forty-three thousand, three hundred fifty-one".