138783157 has 2 divisors, whose sum is σ = 138783158. Its totient is φ = 138783156.

The previous prime is 138783149. The next prime is 138783247. The reversal of 138783157 is 751387831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132503121 + 6280036 = 11511^2 + 2506^2 .

It is an emirp because it is prime and its reverse (751387831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138783157 - 2³ = 138783149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138783137) 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, 69391578 + 69391579.

It is an arithmetic number, because the mean of its divisors is an integer number (69391579).

Almost surely, 2^138783157 is an apocalyptic number.

It is an amenable number.

138783157 is a deficient number, since it is larger than the sum of its proper divisors (1).

138783157 is an equidigital number, since it uses as much as digits as its factorization.

138783157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 43.

The square root of 138783157 is about 11780.6263415830. The cubic root of 138783157 is about 517.7406375397.

The spelling of 138783157 in words is "one hundred thirty-eight million, seven hundred eighty-three thousand, one hundred fifty-seven".