195135111081 has 27 divisors (see below), whose sum is σ = 283539001239. Its totient is φ = 129320561232.

The previous prime is 195135111071. The next prime is 195135111091. The reversal of 195135111081 is 180111531591.

The square root of 195135111081 is 441741.

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

195135111081 is a `hidden beast` number, since 1 + 9 + 51 + 3 + 511 + 10 + 81 = 666.

It is an interprime number because it is at equal distance from previous prime (195135111071) and next prime (195135111091).

It can be written as a sum of positive squares in only one way, i.e., 181739363481 + 13395747600 = 426309^2 + 115740^2 .

It is not a de Polignac number, because 195135111081 - 2¹⁷ = 195134980009 is a prime.

It is a super-3 number, since 3×195135111081³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (195135111001) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 303475746 + ... + 303476388.

Almost surely, 2^195135111081 is an apocalyptic number.

195135111081 is the 441741-st square number.

195135111081 is the 220871-st centered octagonal number.

It is an amenable number.

195135111081 is a deficient number, since it is larger than the sum of its proper divisors (88403890158).

195135111081 is an frugal number, since it uses more digits than its factorization.

195135111081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750 (or 875 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 36.

Multiplying 195135111081 by its sum of digits (36), we get a square (7024863998916 = 2650446²).

The spelling of 195135111081 in words is "one hundred ninety-five billion, one hundred thirty-five million, one hundred eleven thousand, eighty-one".