135991579 has 2 divisors, whose sum is σ = 135991580. Its totient is φ = 135991578.

The previous prime is 135991577. The next prime is 135991591. The reversal of 135991579 is 975199531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 135991579 - 2¹ = 135991577 is a prime.

Together with 135991577, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (135991573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67995789 + 67995790.

It is an arithmetic number, because the mean of its divisors is an integer number (67995790).

Almost surely, 2^135991579 is an apocalyptic number.

135991579 is a deficient number, since it is larger than the sum of its proper divisors (1).

135991579 is an equidigital number, since it uses as much as digits as its factorization.

135991579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 382725, while the sum is 49.

The square root of 135991579 is about 11661.5427367051. The cubic root of 135991579 is about 514.2457038134.

The spelling of 135991579 in words is "one hundred thirty-five million, nine hundred ninety-one thousand, five hundred seventy-nine".