646451143 has 4 divisors (see below), whose sum is σ = 696178168. Its totient is φ = 596724120.

The previous prime is 646451119. The next prime is 646451147. The reversal of 646451143 is 341154646.

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 646451143 - 2⁹ = 646450631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646451099 and 646451108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646451147) 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, 24863493 + ... + 24863518.

It is an arithmetic number, because the mean of its divisors is an integer number (174044542).

Almost surely, 2^646451143 is an apocalyptic number.

646451143 is a deficient number, since it is larger than the sum of its proper divisors (49727025).

646451143 is a wasteful number, since it uses less digits than its factorization.

646451143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49727024.

The product of its digits is 34560, while the sum is 34.

The square root of 646451143 is about 25425.4034972899. The cubic root of 646451143 is about 864.6597358598.

The spelling of 646451143 in words is "six hundred forty-six million, four hundred fifty-one thousand, one hundred forty-three".