135936991 has 2 divisors, whose sum is σ = 135936992. Its totient is φ = 135936990.

The previous prime is 135936989. The next prime is 135937013. The reversal of 135936991 is 199639531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 135936991 - 2¹ = 135936989 is a prime.

Together with 135936989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135936901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67968495 + 67968496.

It is an arithmetic number, because the mean of its divisors is an integer number (67968496).

Almost surely, 2^135936991 is an apocalyptic number.

135936991 is a deficient number, since it is larger than the sum of its proper divisors (1).

135936991 is an equidigital number, since it uses as much as digits as its factorization.

135936991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 196830, while the sum is 46.

The square root of 135936991 is about 11659.2019881294. The cubic root of 135936991 is about 514.1768872941.

The spelling of 135936991 in words is "one hundred thirty-five million, nine hundred thirty-six thousand, nine hundred ninety-one".