646225143 has 4 divisors (see below), whose sum is σ = 861633528. Its totient is φ = 430816760.

The previous prime is 646225141. The next prime is 646225147. The reversal of 646225143 is 341522646.

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 646225143 - 2¹ = 646225141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646225141) 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, 107704188 + ... + 107704193.

It is an arithmetic number, because the mean of its divisors is an integer number (215408382).

Almost surely, 2^646225143 is an apocalyptic number.

646225143 is a deficient number, since it is larger than the sum of its proper divisors (215408385).

646225143 is a wasteful number, since it uses less digits than its factorization.

646225143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215408384.

The product of its digits is 34560, while the sum is 33.

The square root of 646225143 is about 25420.9587348707. The cubic root of 646225143 is about 864.5589621308.

Adding to 646225143 its reverse (341522646), we get a palindrome (987747789).

The spelling of 646225143 in words is "six hundred forty-six million, two hundred twenty-five thousand, one hundred forty-three".