646468049 has 2 divisors, whose sum is σ = 646468050. Its totient is φ = 646468048.

The previous prime is 646468037. The next prime is 646468091. The reversal of 646468049 is 940864646.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588935824 + 57532225 = 24268^2 + 7585^2 .

It is a cyclic number.

It is not a de Polignac number, because 646468049 - 2¹⁶ = 646402513 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 646467994 and 646468012.

It is not a weakly prime, because it can be changed into another prime (646468019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323234024 + 323234025.

It is an arithmetic number, because the mean of its divisors is an integer number (323234025).

Almost surely, 2^646468049 is an apocalyptic number.

It is an amenable number.

646468049 is a deficient number, since it is larger than the sum of its proper divisors (1).

646468049 is an equidigital number, since it uses as much as digits as its factorization.

646468049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 47.

The square root of 646468049 is about 25425.7359578833. The cubic root of 646468049 is about 864.6672733256.

The spelling of 646468049 in words is "six hundred forty-six million, four hundred sixty-eight thousand, forty-nine".