63138923 has 2 divisors, whose sum is σ = 63138924. Its totient is φ = 63138922.

The previous prime is 63138917. The next prime is 63138931. The reversal of 63138923 is 32983136.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63138923 - 2¹⁴ = 63122539 is a prime.

It is a Sophie Germain prime.

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, 31569461 + 31569462.

It is an arithmetic number, because the mean of its divisors is an integer number (31569462).

Almost surely, 2^63138923 is an apocalyptic number.

63138923 is a deficient number, since it is larger than the sum of its proper divisors (1).

63138923 is an equidigital number, since it uses as much as digits as its factorization.

63138923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 35.

The square root of 63138923 is about 7946.0004404732. Note that the first 3 decimals coincide. The cubic root of 63138923 is about 398.1979836166.

The spelling of 63138923 in words is "sixty-three million, one hundred thirty-eight thousand, nine hundred twenty-three".