138563749 has 2 divisors, whose sum is σ = 138563750. Its totient is φ = 138563748.

The previous prime is 138563729. The next prime is 138563767. The reversal of 138563749 is 947365831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108784900 + 29778849 = 10430^2 + 5457^2 .

It is a cyclic number.

It is not a de Polignac number, because 138563749 - 2⁵ = 138563717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138563699 and 138563708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138563729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69281874 + 69281875.

It is an arithmetic number, because the mean of its divisors is an integer number (69281875).

Almost surely, 2^138563749 is an apocalyptic number.

It is an amenable number.

138563749 is a deficient number, since it is larger than the sum of its proper divisors (1).

138563749 is an equidigital number, since it uses as much as digits as its factorization.

138563749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 46.

The square root of 138563749 is about 11771.3104198301. The cubic root of 138563749 is about 517.4676544775.

The spelling of 138563749 in words is "one hundred thirty-eight million, five hundred sixty-three thousand, seven hundred forty-nine".