135979913 has 2 divisors, whose sum is σ = 135979914. Its totient is φ = 135979912.

The previous prime is 135979901. The next prime is 135979969. The reversal of 135979913 is 319979531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134258569 + 1721344 = 11587^2 + 1312^2 .

It is an emirp because it is prime and its reverse (319979531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135979913 - 2⁴ = 135979897 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (135979993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67989956 + 67989957.

It is an arithmetic number, because the mean of its divisors is an integer number (67989957).

Almost surely, 2^135979913 is an apocalyptic number.

It is an amenable number.

135979913 is a deficient number, since it is larger than the sum of its proper divisors (1).

135979913 is an equidigital number, since it uses as much as digits as its factorization.

135979913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 229635, while the sum is 47.

The square root of 135979913 is about 11661.0425348680. The cubic root of 135979913 is about 514.2309985844.

The spelling of 135979913 in words is "one hundred thirty-five million, nine hundred seventy-nine thousand, nine hundred thirteen".