201382181 has 32 divisors (see below), whose sum is σ = 282175488. Its totient is φ = 138536640.

The previous prime is 201382151. The next prime is 201382189. The reversal of 201382181 is 181283102.

It is not a de Polignac number, because 201382181 - 2²² = 197187877 is a prime.

It is a super-2 number, since 2×201382181² = 81109565648633522, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 201382181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201382189) 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, 18650 + ... + 27396.

It is an arithmetic number, because the mean of its divisors is an integer number (8817984).

Almost surely, 2^201382181 is an apocalyptic number.

It is an amenable number.

201382181 is a deficient number, since it is larger than the sum of its proper divisors (80793307).

201382181 is a wasteful number, since it uses less digits than its factorization.

201382181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8801.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 201382181 is about 14190.9189624915. The cubic root of 201382181 is about 586.1476300266.

The spelling of 201382181 in words is "two hundred one million, three hundred eighty-two thousand, one hundred eighty-one".