643151 has 4 divisors (see below), whose sum is σ = 658152. Its totient is φ = 628152.

The previous prime is 643129. The next prime is 643183. The reversal of 643151 is 151346.

643151 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 643151 - 2⁶ = 643087 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 (643121) 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, 7436 + ... + 7521.

It is an arithmetic number, because the mean of its divisors is an integer number (164538).

2⁶⁴³¹⁵¹ is an apocalyptic number.

643151 is a deficient number, since it is larger than the sum of its proper divisors (15001).

643151 is a wasteful number, since it uses less digits than its factorization.

643151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15000.

The product of its digits is 360, while the sum is 20.

The square root of 643151 is about 801.9669569253. The cubic root of 643151 is about 86.3185857880.

Adding to 643151 its reverse (151346), we get a palindrome (794497).

The spelling of 643151 in words is "six hundred forty-three thousand, one hundred fifty-one".