138532469 has 2 divisors, whose sum is σ = 138532470. Its totient is φ = 138532468.

The previous prime is 138532447. The next prime is 138532501. The reversal of 138532469 is 964235831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131446225 + 7086244 = 11465^2 + 2662^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138532469 is a prime.

It is a super-2 number, since 2×138532469² = 38382489934471922, 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 (138532169) 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, 69266234 + 69266235.

It is an arithmetic number, because the mean of its divisors is an integer number (69266235).

Almost surely, 2^138532469 is an apocalyptic number.

It is an amenable number.

138532469 is a deficient number, since it is larger than the sum of its proper divisors (1).

138532469 is an equidigital number, since it uses as much as digits as its factorization.

138532469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 41.

The square root of 138532469 is about 11769.9816907249. The cubic root of 138532469 is about 517.4287130601.

The spelling of 138532469 in words is "one hundred thirty-eight million, five hundred thirty-two thousand, four hundred sixty-nine".