643071151 has 4 divisors (see below), whose sum is σ = 644979712. Its totient is φ = 641162592.

The previous prime is 643071133. The next prime is 643071167. The reversal of 643071151 is 151170346.

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 643071151 - 2⁵ = 643071119 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 (643071181) 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, 953775 + ... + 954448.

It is an arithmetic number, because the mean of its divisors is an integer number (161244928).

Almost surely, 2^643071151 is an apocalyptic number.

643071151 is a deficient number, since it is larger than the sum of its proper divisors (1908561).

643071151 is a wasteful number, since it uses less digits than its factorization.

643071151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908560.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 643071151 is about 25358.8475881693. The cubic root of 643071151 is about 863.1501340863.

The spelling of 643071151 in words is "six hundred forty-three million, seventy-one thousand, one hundred fifty-one".