643125053 has 4 divisors (see below), whose sum is σ = 676973760. Its totient is φ = 609276348.

The previous prime is 643125031. The next prime is 643125059. The reversal of 643125053 is 350521346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 643125053 - 2²⁸ = 374689597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643125059) 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 in 3 ways as a sum of consecutive naturals, for example, 16924325 + ... + 16924362.

It is an arithmetic number, because the mean of its divisors is an integer number (169243440).

Almost surely, 2^643125053 is an apocalyptic number.

It is an amenable number.

643125053 is a deficient number, since it is larger than the sum of its proper divisors (33848707).

643125053 is a wasteful number, since it uses less digits than its factorization.

643125053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33848706.

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

The square root of 643125053 is about 25359.9103507879. The cubic root of 643125053 is about 863.1742497271.

Adding to 643125053 its reverse (350521346), we get a palindrome (993646399).

The spelling of 643125053 in words is "six hundred forty-three million, one hundred twenty-five thousand, fifty-three".