201131665 has 16 divisors (see below), whose sum is σ = 287831808. Its totient is φ = 131921856.

The previous prime is 201131657. The next prime is 201131677. The reversal of 201131665 is 566131102.

It is a cyclic number.

It is not a de Polignac number, because 201131665 - 2³ = 201131657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124122 + ... + 125731.

It is an arithmetic number, because the mean of its divisors is an integer number (17989488).

Almost surely, 2^201131665 is an apocalyptic number.

It is an amenable number.

201131665 is a deficient number, since it is larger than the sum of its proper divisors (86700143).

201131665 is a wasteful number, since it uses less digits than its factorization.

201131665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249888.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 201131665 is about 14182.0895851070. The cubic root of 201131665 is about 585.9044766194.

Adding to 201131665 its reverse (566131102), we get a palindrome (767262767).

The spelling of 201131665 in words is "two hundred one million, one hundred thirty-one thousand, six hundred sixty-five".