135979 has 2 divisors, whose sum is σ = 135980. Its totient is φ = 135978.

The previous prime is 135977. The next prime is 136013. The reversal of 135979 is 979531.

It is an a-pointer prime, because the next prime (136013) can be obtained adding 135979 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 135979 - 2¹ = 135977 is a prime.

Together with 135977, it forms a pair of twin primes.

It is an Ulam number.

135979 is a lucky number.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (135977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67989 + 67990.

It is an arithmetic number, because the mean of its divisors is an integer number (67990).

2¹³⁵⁹⁷⁹ is an apocalyptic number.

135979 is a deficient number, since it is larger than the sum of its proper divisors (1).

135979 is an equidigital number, since it uses as much as digits as its factorization.

135979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8505, while the sum is 34.

The square root of 135979 is about 368.7533050699. The cubic root of 135979 is about 51.4229847694.

The spelling of 135979 in words is "one hundred thirty-five thousand, nine hundred seventy-nine".