646331441 has 16 divisors (see below), whose sum is σ = 771585024. Its totient is φ = 529358544.

The previous prime is 646331377. The next prime is 646331461. The reversal of 646331441 is 144133646.

It is a cyclic number.

It is not a de Polignac number, because 646331441 - 2⁶ = 646331377 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646331398 and 646331407.

It is not an unprimeable number, because it can be changed into a prime (646331461) 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 15 ways as a sum of consecutive naturals, for example, 237410 + ... + 240116.

It is an arithmetic number, because the mean of its divisors is an integer number (48224064).

Almost surely, 2^646331441 is an apocalyptic number.

It is an amenable number.

646331441 is a deficient number, since it is larger than the sum of its proper divisors (125253583).

646331441 is a wasteful number, since it uses less digits than its factorization.

646331441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4220.

The product of its digits is 20736, while the sum is 32.

The square root of 646331441 is about 25423.0494040349. The cubic root of 646331441 is about 864.6063634898.

The spelling of 646331441 in words is "six hundred forty-six million, three hundred thirty-one thousand, four hundred forty-one".