138796913 has 2 divisors, whose sum is σ = 138796914. Its totient is φ = 138796912.

The previous prime is 138796909. The next prime is 138796937. The reversal of 138796913 is 319697831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117332224 + 21464689 = 10832^2 + 4633^2 .

It is an emirp because it is prime and its reverse (319697831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138796913 - 2² = 138796909 is a prime.

It is not a weakly prime, because it can be changed into another prime (138796943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69398456 + 69398457.

It is an arithmetic number, because the mean of its divisors is an integer number (69398457).

Almost surely, 2^138796913 is an apocalyptic number.

It is an amenable number.

138796913 is a deficient number, since it is larger than the sum of its proper divisors (1).

138796913 is an equidigital number, since it uses as much as digits as its factorization.

138796913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 47.

The square root of 138796913 is about 11781.2101670414. The cubic root of 138796913 is about 517.7577428933.

The spelling of 138796913 in words is "one hundred thirty-eight million, seven hundred ninety-six thousand, nine hundred thirteen".