865222143 has 4 divisors (see below), whose sum is σ = 1153629528. Its totient is φ = 576814760.

The previous prime is 865222103. The next prime is 865222147. The reversal of 865222143 is 341222568.

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 865222143 - 2¹² = 865218047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865222147) 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, 144203688 + ... + 144203693.

It is an arithmetic number, because the mean of its divisors is an integer number (288407382).

Almost surely, 2^865222143 is an apocalyptic number.

865222143 is a deficient number, since it is larger than the sum of its proper divisors (288407385).

865222143 is a wasteful number, since it uses less digits than its factorization.

865222143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288407384.

The product of its digits is 23040, while the sum is 33.

The square root of 865222143 is about 29414.6586415685. The cubic root of 865222143 is about 952.8895008722.

The spelling of 865222143 in words is "eight hundred sixty-five million, two hundred twenty-two thousand, one hundred forty-three".