63138709 has 2 divisors, whose sum is σ = 63138710. Its totient is φ = 63138708.

The previous prime is 63138707. The next prime is 63138727. The reversal of 63138709 is 90783136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59336209 + 3802500 = 7703^2 + 1950^2 .

It is a cyclic number.

It is not a de Polignac number, because 63138709 - 2¹ = 63138707 is a prime.

Together with 63138707, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63138701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31569354 + 31569355.

It is an arithmetic number, because the mean of its divisors is an integer number (31569355).

Almost surely, 2^63138709 is an apocalyptic number.

It is an amenable number.

63138709 is a deficient number, since it is larger than the sum of its proper divisors (1).

63138709 is an equidigital number, since it uses as much as digits as its factorization.

63138709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 63138709 is about 7945.9869745677. The cubic root of 63138709 is about 398.1975337385.

It can be divided in two parts, 631 and 38709, that added together give a triangular number (39340 = T₂₈₀).

The spelling of 63138709 in words is "sixty-three million, one hundred thirty-eight thousand, seven hundred nine".