138353972909 has 2 divisors, whose sum is σ = 138353972910. Its totient is φ = 138353972908.

The previous prime is 138353972837. The next prime is 138353972941. The reversal of 138353972909 is 909279353831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92106180100 + 46247792809 = 303490^2 + 215053^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138353972909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138353972959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69176986454 + 69176986455.

It is an arithmetic number, because the mean of its divisors is an integer number (69176986455).

Almost surely, 2^138353972909 is an apocalyptic number.

It is an amenable number.

138353972909 is a deficient number, since it is larger than the sum of its proper divisors (1).

138353972909 is an equidigital number, since it uses as much as digits as its factorization.

138353972909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11022480, while the sum is 59.

The spelling of 138353972909 in words is "one hundred thirty-eight billion, three hundred fifty-three million, nine hundred seventy-two thousand, nine hundred nine".