138102049 has 2 divisors, whose sum is σ = 138102050. Its totient is φ = 138102048.

The previous prime is 138102043. The next prime is 138102061. The reversal of 138102049 is 940201831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100500625 + 37601424 = 10025^2 + 6132^2 .

It is a cyclic number.

It is not a de Polignac number, because 138102049 - 2¹⁷ = 137970977 is a prime.

It is not a weakly prime, because it can be changed into another prime (138102043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69051024 + 69051025.

It is an arithmetic number, because the mean of its divisors is an integer number (69051025).

Almost surely, 2^138102049 is an apocalyptic number.

It is an amenable number.

138102049 is a deficient number, since it is larger than the sum of its proper divisors (1).

138102049 is an equidigital number, since it uses as much as digits as its factorization.

138102049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 138102049 is about 11751.6828156652. The cubic root of 138102049 is about 516.8922739083.

The spelling of 138102049 in words is "one hundred thirty-eight million, one hundred two thousand, forty-nine".