131011665 has 16 divisors (see below), whose sum is σ = 210211200. Its totient is φ = 69675392.

The previous prime is 131011651. The next prime is 131011679. The reversal of 131011665 is 566110131.

It is an interprime number because it is at equal distance from previous prime (131011651) and next prime (131011679).

It is a cyclic number.

It is not a de Polignac number, because 131011665 - 2¹⁰ = 131010641 is a prime.

It is a Curzon 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, 6780 + ... + 17549.

It is an arithmetic number, because the mean of its divisors is an integer number (13138200).

Almost surely, 2^131011665 is an apocalyptic number.

131011665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131011665 is a deficient number, since it is larger than the sum of its proper divisors (79199535).

131011665 is a wasteful number, since it uses less digits than its factorization.

131011665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24696.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 131011665 is about 11446.0327188070. The cubic root of 131011665 is about 507.8903820871.

Adding to 131011665 its reverse (566110131), we get a palindrome (697121796).

The spelling of 131011665 in words is "one hundred thirty-one million, eleven thousand, six hundred sixty-five".