135491977 has 2 divisors, whose sum is σ = 135491978. Its totient is φ = 135491976.

The previous prime is 135491959. The next prime is 135491981. The reversal of 135491977 is 779194531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135396496 + 95481 = 11636^2 + 309^2 .

It is a cyclic number.

It is not a de Polignac number, because 135491977 - 2¹⁹ = 134967689 is a prime.

It is not a weakly prime, because it can be changed into another prime (135491947) 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, 67745988 + 67745989.

It is an arithmetic number, because the mean of its divisors is an integer number (67745989).

Almost surely, 2^135491977 is an apocalyptic number.

It is an amenable number.

135491977 is a deficient number, since it is larger than the sum of its proper divisors (1).

135491977 is an equidigital number, since it uses as much as digits as its factorization.

135491977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 238140, while the sum is 46.

The square root of 135491977 is about 11640.1021043632. The cubic root of 135491977 is about 513.6151906417.

The spelling of 135491977 in words is "one hundred thirty-five million, four hundred ninety-one thousand, nine hundred seventy-seven".