6349964921 has 2 divisors, whose sum is σ = 6349964922. Its totient is φ = 6349964920.

The previous prime is 6349964911. The next prime is 6349964941. The reversal of 6349964921 is 1294699436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5334841600 + 1015123321 = 73040^2 + 31861^2 .

It is a cyclic number.

It is not a de Polignac number, because 6349964921 - 2²² = 6345770617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6349964911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3174982460 + 3174982461.

It is an arithmetic number, because the mean of its divisors is an integer number (3174982461).

Almost surely, 2^6349964921 is an apocalyptic number.

It is an amenable number.

6349964921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6349964921 is an equidigital number, since it uses as much as digits as its factorization.

6349964921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 53.

The square root of 6349964921 is about 79686.6671470203. The cubic root of 6349964921 is about 1851.7844891054.

The spelling of 6349964921 in words is "six billion, three hundred forty-nine million, nine hundred sixty-four thousand, nine hundred twenty-one".