63998069 has 2 divisors, whose sum is σ = 63998070. Its totient is φ = 63998068.

The previous prime is 63998027. The next prime is 63998071. The reversal of 63998069 is 96089936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51480625 + 12517444 = 7175^2 + 3538^2 .

It is a cyclic number.

It is not a de Polignac number, because 63998069 - 2¹² = 63993973 is a prime.

It is a super-2 number, since 2×63998069² = 8191505671457522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 63998071, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63998009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31999034 + 31999035.

It is an arithmetic number, because the mean of its divisors is an integer number (31999035).

Almost surely, 2^63998069 is an apocalyptic number.

It is an amenable number.

63998069 is a deficient number, since it is larger than the sum of its proper divisors (1).

63998069 is an equidigital number, since it uses as much as digits as its factorization.

63998069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 63998069 is about 7999.8793115896. The cubic root of 63998069 is about 399.9959770429.

The spelling of 63998069 in words is "sixty-three million, nine hundred ninety-eight thousand, sixty-nine".