65143891 has 4 divisors (see below), whose sum is σ = 65503984. Its totient is φ = 64783800.

The previous prime is 65143873. The next prime is 65143907. The reversal of 65143891 is 19834156.

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 65143891 - 2¹³ = 65135699 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 65143891.

It is not an unprimeable number, because it can be changed into a prime (65143801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179775 + ... + 180136.

It is an arithmetic number, because the mean of its divisors is an integer number (16375996).

Almost surely, 2^65143891 is an apocalyptic number.

65143891 is a deficient number, since it is larger than the sum of its proper divisors (360093).

65143891 is a wasteful number, since it uses less digits than its factorization.

65143891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360092.

The product of its digits is 25920, while the sum is 37.

The square root of 65143891 is about 8071.1765561162. The cubic root of 65143891 is about 402.3690475838.

The spelling of 65143891 in words is "sixty-five million, one hundred forty-three thousand, eight hundred ninety-one".