643142451 has 8 divisors (see below), whose sum is σ = 980026624. Its totient is φ = 367509960.

The previous prime is 643142449. The next prime is 643142471. The reversal of 643142451 is 154241346.

643142451 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 not a de Polignac number, because 643142451 - 2¹ = 643142449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643142411) 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, 15312895 + ... + 15312936.

It is an arithmetic number, because the mean of its divisors is an integer number (122503328).

Almost surely, 2^643142451 is an apocalyptic number.

643142451 is a deficient number, since it is larger than the sum of its proper divisors (336884173).

643142451 is a wasteful number, since it uses less digits than its factorization.

643142451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30625841.

The product of its digits is 11520, while the sum is 30.

The square root of 643142451 is about 25360.2533701854. The cubic root of 643142451 is about 863.1820332678.

Adding to 643142451 its reverse (154241346), we get a palindrome (797383797).

The spelling of 643142451 in words is "six hundred forty-three million, one hundred forty-two thousand, four hundred fifty-one".