138752917 has 2 divisors, whose sum is σ = 138752918. Its totient is φ = 138752916.

The previous prime is 138752909. The next prime is 138752927. The reversal of 138752917 is 719257831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137217796 + 1535121 = 11714^2 + 1239^2 .

It is a cyclic number.

It is not a de Polignac number, because 138752917 - 2³ = 138752909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138752927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69376458 + 69376459.

It is an arithmetic number, because the mean of its divisors is an integer number (69376459).

Almost surely, 2^138752917 is an apocalyptic number.

It is an amenable number.

138752917 is a deficient number, since it is larger than the sum of its proper divisors (1).

138752917 is an equidigital number, since it uses as much as digits as its factorization.

138752917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 43.

The square root of 138752917 is about 11779.3428084932. The cubic root of 138752917 is about 517.7030306367.

The spelling of 138752917 in words is "one hundred thirty-eight million, seven hundred fifty-two thousand, nine hundred seventeen".