646383731 has 4 divisors (see below), whose sum is σ = 738724272. Its totient is φ = 554043192.

The previous prime is 646383713. The next prime is 646383733. The reversal of 646383731 is 137383646.

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 646383731 - 2¹⁰ = 646382707 is a prime.

It is a super-2 number, since 2×646383731² = 835623855402960722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646383733) 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, 46170260 + ... + 46170273.

It is an arithmetic number, because the mean of its divisors is an integer number (184681068).

Almost surely, 2^646383731 is an apocalyptic number.

646383731 is a deficient number, since it is larger than the sum of its proper divisors (92340541).

646383731 is an equidigital number, since it uses as much as digits as its factorization.

646383731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92340540.

The product of its digits is 217728, while the sum is 41.

The square root of 646383731 is about 25424.0777807180. The cubic root of 646383731 is about 864.6296792092.

The spelling of 646383731 in words is "six hundred forty-six million, three hundred eighty-three thousand, seven hundred thirty-one".