63842921 has 2 divisors, whose sum is σ = 63842922. Its totient is φ = 63842920.

The previous prime is 63842887. The next prime is 63842927. The reversal of 63842921 is 12924836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57592921 + 6250000 = 7589^2 + 2500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63842921 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (63842927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31921460 + 31921461.

It is an arithmetic number, because the mean of its divisors is an integer number (31921461).

Almost surely, 2^63842921 is an apocalyptic number.

It is an amenable number.

63842921 is a deficient number, since it is larger than the sum of its proper divisors (1).

63842921 is an equidigital number, since it uses as much as digits as its factorization.

63842921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 63842921 is about 7990.1765312163. The cubic root of 63842921 is about 399.6724839897.

The spelling of 63842921 in words is "sixty-three million, eight hundred forty-two thousand, nine hundred twenty-one".