135311781639 has 32 divisors (see below), whose sum is σ = 192414942720. Its totient is φ = 84286856192.

The previous prime is 135311781629. The next prime is 135311781679. The reversal of 135311781639 is 936187113531.

It is a cyclic number.

It is not a de Polignac number, because 135311781639 - 2⁷ = 135311781511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135311781629) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5620582 + ... + 5644604.

It is an arithmetic number, because the mean of its divisors is an integer number (6012966960).

Almost surely, 2^135311781639 is an apocalyptic number.

135311781639 is a deficient number, since it is larger than the sum of its proper divisors (57103161081).

135311781639 is a wasteful number, since it uses less digits than its factorization.

135311781639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24839.

The product of its digits is 408240, while the sum is 48.

The spelling of 135311781639 in words is "one hundred thirty-five billion, three hundred eleven million, seven hundred eighty-one thousand, six hundred thirty-nine".