63138917 has 2 divisors, whose sum is σ = 63138918. Its totient is φ = 63138916.

The previous prime is 63138913. The next prime is 63138923. The reversal of 63138917 is 71983136.

It is a Cunningham number, because it is equal to 7946²+1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63138916 + 1 = 7946^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 63138917 - 2² = 63138913 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63138913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31569458 + 31569459.

It is an arithmetic number, because the mean of its divisors is an integer number (31569459).

Almost surely, 2^63138917 is an apocalyptic number.

It is an amenable number.

63138917 is a deficient number, since it is larger than the sum of its proper divisors (1).

63138917 is an equidigital number, since it uses as much as digits as its factorization.

63138917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 63138917 is about 7946.0000629247. Note that the first 4 decimals coincide. The cubic root of 63138917 is about 398.1979710032.

The spelling of 63138917 in words is "sixty-three million, one hundred thirty-eight thousand, nine hundred seventeen".