138032861 has 2 divisors, whose sum is σ = 138032862. Its totient is φ = 138032860.

The previous prime is 138032833. The next prime is 138032879. The reversal of 138032861 is 168230831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106605625 + 31427236 = 10325^2 + 5606^2 .

It is a cyclic number.

It is not a de Polignac number, because 138032861 - 2¹⁴ = 138016477 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138034861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69016430 + 69016431.

It is an arithmetic number, because the mean of its divisors is an integer number (69016431).

Almost surely, 2^138032861 is an apocalyptic number.

It is an amenable number.

138032861 is a deficient number, since it is larger than the sum of its proper divisors (1).

138032861 is an equidigital number, since it uses as much as digits as its factorization.

138032861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 138032861 is about 11748.7386982603. The cubic root of 138032861 is about 516.8059398849.

The spelling of 138032861 in words is "one hundred thirty-eight million, thirty-two thousand, eight hundred sixty-one".