138085949 has 2 divisors, whose sum is σ = 138085950. Its totient is φ = 138085948.

The previous prime is 138085931. The next prime is 138085963. The reversal of 138085949 is 949580831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115713049 + 22372900 = 10757^2 + 4730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138085949 is a prime.

It is a super-2 number, since 2×138085949² = 38135458622461202, which contains 22 as substring.

It is a Sophie Germain 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 (138085049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69042974 + 69042975.

It is an arithmetic number, because the mean of its divisors is an integer number (69042975).

Almost surely, 2^138085949 is an apocalyptic number.

It is an amenable number.

138085949 is a deficient number, since it is larger than the sum of its proper divisors (1).

138085949 is an equidigital number, since it uses as much as digits as its factorization.

138085949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 138085949 is about 11750.9977874221. The cubic root of 138085949 is about 516.8721866152.

The spelling of 138085949 in words is "one hundred thirty-eight million, eighty-five thousand, nine hundred forty-nine".