643232053 has 4 divisors (see below), whose sum is σ = 671198688. Its totient is φ = 615265420.

The previous prime is 643232041. The next prime is 643232059. The reversal of 643232053 is 350232346.

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 a de Polignac number, because none of the positive numbers 2^k-643232053 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 (643232059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13983283 + ... + 13983328.

It is an arithmetic number, because the mean of its divisors is an integer number (167799672).

Almost surely, 2^643232053 is an apocalyptic number.

It is an amenable number.

643232053 is a deficient number, since it is larger than the sum of its proper divisors (27966635).

643232053 is a wasteful number, since it uses less digits than its factorization.

643232053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27966634.

The product of its (nonzero) digits is 12960, while the sum is 28.

The square root of 643232053 is about 25362.0198919566. The cubic root of 643232053 is about 863.2221173088. Note that the first 3 decimals are identical.

Adding to 643232053 its reverse (350232346), we get a palindrome (993464399).

The spelling of 643232053 in words is "six hundred forty-three million, two hundred thirty-two thousand, fifty-three".