135491947 has 2 divisors, whose sum is σ = 135491948. Its totient is φ = 135491946.

The previous prime is 135491933. The next prime is 135491959. The reversal of 135491947 is 749194531.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135491947 is a prime.

It is not a weakly prime, because it can be changed into another prime (135491977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67745973 + 67745974.

It is an arithmetic number, because the mean of its divisors is an integer number (67745974).

Almost surely, 2^135491947 is an apocalyptic number.

135491947 is a deficient number, since it is larger than the sum of its proper divisors (1).

135491947 is an equidigital number, since it uses as much as digits as its factorization.

135491947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 43.

The square root of 135491947 is about 11640.1008157146. The cubic root of 135491947 is about 513.6151527343.

The spelling of 135491947 in words is "one hundred thirty-five million, four hundred ninety-one thousand, nine hundred forty-seven".