646264121 has 2 divisors, whose sum is σ = 646264122. Its totient is φ = 646264120.

The previous prime is 646264117. The next prime is 646264133. The reversal of 646264121 is 121462646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 419430400 + 226833721 = 20480^2 + 15061^2 .

It is a cyclic number.

It is not a de Polignac number, because 646264121 - 2² = 646264117 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (646264141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323132060 + 323132061.

It is an arithmetic number, because the mean of its divisors is an integer number (323132061).

Almost surely, 2^646264121 is an apocalyptic number.

It is an amenable number.

646264121 is a deficient number, since it is larger than the sum of its proper divisors (1).

646264121 is an equidigital number, since it uses as much as digits as its factorization.

646264121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 32.

The square root of 646264121 is about 25421.7253741755. The cubic root of 646264121 is about 864.5763441542.

The spelling of 646264121 in words is "six hundred forty-six million, two hundred sixty-four thousand, one hundred twenty-one".