643467151 has 4 divisors (see below), whose sum is σ = 643813672. Its totient is φ = 643120632.

The previous prime is 643467133. The next prime is 643467163. The reversal of 643467151 is 151764346.

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 643467151 - 2⁹ = 643466639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643467151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643467131) 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, 170460 + ... + 174193.

It is an arithmetic number, because the mean of its divisors is an integer number (160953418).

Almost surely, 2^643467151 is an apocalyptic number.

643467151 is a deficient number, since it is larger than the sum of its proper divisors (346521).

643467151 is a wasteful number, since it uses less digits than its factorization.

643467151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346520.

The product of its digits is 60480, while the sum is 37.

The square root of 643467151 is about 25366.6543123054. The cubic root of 643467151 is about 863.3272722435.

The spelling of 643467151 in words is "six hundred forty-three million, four hundred sixty-seven thousand, one hundred fifty-one".