646243031 has 4 divisors (see below), whose sum is σ = 738563472. Its totient is φ = 553922592.

The previous prime is 646243027. The next prime is 646243033. The reversal of 646243031 is 130342646.

646243031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 646243031 - 2² = 646243027 is a prime.

It is a super-2 number, since 2×646243031² = 835260110232133922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646242985 and 646243003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646243033) 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, 46160210 + ... + 46160223.

It is an arithmetic number, because the mean of its divisors is an integer number (184640868).

Almost surely, 2^646243031 is an apocalyptic number.

646243031 is a deficient number, since it is larger than the sum of its proper divisors (92320441).

646243031 is an equidigital number, since it uses as much as digits as its factorization.

646243031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92320440.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 646243031 is about 25421.3105681041. The cubic root of 646243031 is about 864.5669392722.

Adding to 646243031 its reverse (130342646), we get a palindrome (776585677).

The spelling of 646243031 in words is "six hundred forty-six million, two hundred forty-three thousand, thirty-one".