643461313 has 4 divisors (see below), whose sum is σ = 701957808. Its totient is φ = 584964820.

The previous prime is 643461289. The next prime is 643461383. The reversal of 643461313 is 313164346.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 643461313 - 2⁵ = 643461281 is a prime.

It is a super-2 number, since 2×643461313² = 828084922655367938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643461383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29248231 + ... + 29248252.

It is an arithmetic number, because the mean of its divisors is an integer number (175489452).

Almost surely, 2^643461313 is an apocalyptic number.

It is an amenable number.

643461313 is a deficient number, since it is larger than the sum of its proper divisors (58496495).

643461313 is a wasteful number, since it uses less digits than its factorization.

643461313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58496494.

The product of its digits is 15552, while the sum is 31.

The square root of 643461313 is about 25366.5392397150. The cubic root of 643461313 is about 863.3246613255.

The spelling of 643461313 in words is "six hundred forty-three million, four hundred sixty-one thousand, three hundred thirteen".