138949241 has 2 divisors, whose sum is σ = 138949242. Its totient is φ = 138949240.

The previous prime is 138949219. The next prime is 138949243. The reversal of 138949241 is 142949831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110166016 + 28783225 = 10496^2 + 5365^2 .

It is a cyclic number.

It is not a de Polignac number, because 138949241 - 2¹⁸ = 138687097 is a prime.

It is a Sophie Germain prime.

Together with 138949243, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (138949243) 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, 69474620 + 69474621.

It is an arithmetic number, because the mean of its divisors is an integer number (69474621).

Almost surely, 2^138949241 is an apocalyptic number.

It is an amenable number.

138949241 is a deficient number, since it is larger than the sum of its proper divisors (1).

138949241 is an equidigital number, since it uses as much as digits as its factorization.

138949241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 138949241 is about 11787.6732648984. The cubic root of 138949241 is about 517.9470846798.

The spelling of 138949241 in words is "one hundred thirty-eight million, nine hundred forty-nine thousand, two hundred forty-one".