138283549 has 2 divisors, whose sum is σ = 138283550. Its totient is φ = 138283548.

The previous prime is 138283547. The next prime is 138283573. The reversal of 138283549 is 945382831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113103225 + 25180324 = 10635^2 + 5018^2 .

It is a cyclic number.

It is not a de Polignac number, because 138283549 - 2¹ = 138283547 is a prime.

Together with 138283547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138283543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69141774 + 69141775.

It is an arithmetic number, because the mean of its divisors is an integer number (69141775).

Almost surely, 2^138283549 is an apocalyptic number.

It is an amenable number.

138283549 is a deficient number, since it is larger than the sum of its proper divisors (1).

138283549 is an equidigital number, since it uses as much as digits as its factorization.

138283549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 43.

The square root of 138283549 is about 11759.4025783626. The cubic root of 138283549 is about 517.1186159004.

The spelling of 138283549 in words is "one hundred thirty-eight million, two hundred eighty-three thousand, five hundred forty-nine".