63138739 has 2 divisors, whose sum is σ = 63138740. Its totient is φ = 63138738.

The previous prime is 63138737. The next prime is 63138763. The reversal of 63138739 is 93783136.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63138739 - 2¹ = 63138737 is a prime.

Together with 63138737, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (63138737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31569369 + 31569370.

It is an arithmetic number, because the mean of its divisors is an integer number (31569370).

Almost surely, 2^63138739 is an apocalyptic number.

63138739 is a deficient number, since it is larger than the sum of its proper divisors (1).

63138739 is an equidigital number, since it uses as much as digits as its factorization.

63138739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 40.

The square root of 63138739 is about 7945.9888623129. The cubic root of 63138739 is about 398.1975968055.

The spelling of 63138739 in words is "sixty-three million, one hundred thirty-eight thousand, seven hundred thirty-nine".