135781777 has 2 divisors, whose sum is σ = 135781778. Its totient is φ = 135781776.

The previous prime is 135781757. The next prime is 135781781. The reversal of 135781777 is 777187531.

135781777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107308881 + 28472896 = 10359^2 + 5336^2 .

It is a cyclic number.

It is not a de Polignac number, because 135781777 - 2⁷ = 135781649 is a prime.

It is not a weakly prime, because it can be changed into another prime (135781747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67890888 + 67890889.

It is an arithmetic number, because the mean of its divisors is an integer number (67890889).

Almost surely, 2^135781777 is an apocalyptic number.

It is an amenable number.

135781777 is a deficient number, since it is larger than the sum of its proper divisors (1).

135781777 is an equidigital number, since it uses as much as digits as its factorization.

135781777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288120, while the sum is 46.

The square root of 135781777 is about 11652.5437995315. The cubic root of 135781777 is about 513.9811155986.

The spelling of 135781777 in words is "one hundred thirty-five million, seven hundred eighty-one thousand, seven hundred seventy-seven".