135520433161 has 9 divisors (see below), whose sum is σ = 135970674471. Its totient is φ = 135071681472.

The previous prime is 135520433143. The next prime is 135520433171. The reversal of 135520433161 is 161334025531.

The square root of 135520433161 is 368131.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 44350254025 + 91170179136 = 210595^2 + 301944^2 .

It is not a de Polignac number, because 135520433161 - 2¹¹ = 135520431113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135520433171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 201367321 + ... + 201367993.

It is an arithmetic number, because the mean of its divisors is an integer number (15107852719).

Almost surely, 2^135520433161 is an apocalyptic number.

135520433161 is the 368131-st square number.

135520433161 is the 184066-th centered octagonal number.

It is an amenable number.

135520433161 is a deficient number, since it is larger than the sum of its proper divisors (450241310).

135520433161 is an frugal number, since it uses more digits than its factorization.

135520433161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440 (or 1220 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 34.

Adding to 135520433161 its reverse (161334025531), we get a palindrome (296854458692).

The spelling of 135520433161 in words is "one hundred thirty-five billion, five hundred twenty million, four hundred thirty-three thousand, one hundred sixty-one".