646043031 has 24 divisors (see below), whose sum is σ = 943587840. Its totient is φ = 425912256.

The previous prime is 646043029. The next prime is 646043053. The reversal of 646043031 is 130340646.

646043031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 646043031 - 2¹ = 646043029 is a prime.

It is a super-2 number, since 2×646043031² = 834743195807333922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 646042986 and 646043004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646043071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 443901 + ... + 445353.

It is an arithmetic number, because the mean of its divisors is an integer number (39316160).

Almost surely, 2^646043031 is an apocalyptic number.

646043031 is a deficient number, since it is larger than the sum of its proper divisors (297544809).

646043031 is a wasteful number, since it uses less digits than its factorization.

646043031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1975 (or 1972 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 646043031 is about 25417.3765562066. The cubic root of 646043031 is about 864.4777410292.

Adding to 646043031 its reverse (130340646), we get a palindrome (776383677).

The spelling of 646043031 in words is "six hundred forty-six million, forty-three thousand, thirty-one".