646161331 has 2 divisors, whose sum is σ = 646161332. Its totient is φ = 646161330.

The previous prime is 646161323. The next prime is 646161343. The reversal of 646161331 is 133161646.

646161331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646161331 - 2³ = 646161323 is a prime.

It is a super-2 number, since 2×646161331² = 835048931359383122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 646161293 and 646161302.

It is not a weakly prime, because it can be changed into another prime (646161361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323080665 + 323080666.

It is an arithmetic number, because the mean of its divisors is an integer number (323080666).

Almost surely, 2^646161331 is an apocalyptic number.

646161331 is a deficient number, since it is larger than the sum of its proper divisors (1).

646161331 is an equidigital number, since it uses as much as digits as its factorization.

646161331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 646161331 is about 25419.7035977999. The cubic root of 646161331 is about 864.5305040136.

The spelling of 646161331 in words is "six hundred forty-six million, one hundred sixty-one thousand, three hundred thirty-one".