201092181138 has 24 divisors (see below), whose sum is σ = 435834785100. Its totient is φ = 67009948704.

The previous prime is 201092181131. The next prime is 201092181293. The reversal of 201092181138 is 831181290102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 197138664009 + 3953517129 = 444003^2 + 62877^2 .

It is not an unprimeable number, because it can be changed into a prime (201092181131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1671793 + ... + 1788036.

Almost surely, 2^201092181138 is an apocalyptic number.

201092181138 is an abundant number, since it is smaller than the sum of its proper divisors (234742603962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201092181138 is a wasteful number, since it uses less digits than its factorization.

201092181138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3463066 (or 3463063 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The spelling of 201092181138 in words is "two hundred one billion, ninety-two million, one hundred eighty-one thousand, one hundred thirty-eight".