642530351 has 8 divisors (see below), whose sum is σ = 703786320. Its totient is φ = 583881088.

The previous prime is 642530321. The next prime is 642530401. The reversal of 642530351 is 153035246.

642530351 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642530351 - 2²² = 638336047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642530321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 651161 + ... + 652146.

It is an arithmetic number, because the mean of its divisors is an integer number (87973290).

Almost surely, 2^642530351 is an apocalyptic number.

642530351 is a deficient number, since it is larger than the sum of its proper divisors (61255969).

642530351 is a wasteful number, since it uses less digits than its factorization.

642530351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303353.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 642530351 is about 25348.1824003221. The cubic root of 642530351 is about 862.9081066918.

Adding to 642530351 its reverse (153035246), we get a palindrome (795565597).

The spelling of 642530351 in words is "six hundred forty-two million, five hundred thirty thousand, three hundred fifty-one".