135394991 has 2 divisors, whose sum is σ = 135394992. Its totient is φ = 135394990.

The previous prime is 135394967. The next prime is 135395017. The reversal of 135394991 is 199493531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 135394991 - 2⁶ = 135394927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135394291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67697495 + 67697496.

It is an arithmetic number, because the mean of its divisors is an integer number (67697496).

Almost surely, 2^135394991 is an apocalyptic number.

135394991 is a deficient number, since it is larger than the sum of its proper divisors (1).

135394991 is an equidigital number, since it uses as much as digits as its factorization.

135394991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131220, while the sum is 44.

The square root of 135394991 is about 11635.9353298306. The cubic root of 135394991 is about 513.4926117400.

The spelling of 135394991 in words is "one hundred thirty-five million, three hundred ninety-four thousand, nine hundred ninety-one".