131206617 has 12 divisors (see below), whose sum is σ = 190122660. Its totient is φ = 87193248.

The previous prime is 131206613. The next prime is 131206639. The reversal of 131206617 is 716602131.

It can be written as a sum of positive squares in 2 ways, for example, as 3426201 + 127780416 = 1851^2 + 11304^2 .

It is not a de Polignac number, because 131206617 - 2² = 131206613 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131206613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20142 + ... + 25847.

It is an arithmetic number, because the mean of its divisors is an integer number (15843555).

Almost surely, 2^131206617 is an apocalyptic number.

It is an amenable number.

131206617 is a deficient number, since it is larger than the sum of its proper divisors (58916043).

131206617 is a wasteful number, since it uses less digits than its factorization.

131206617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46312 (or 46309 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 131206617 is about 11454.5456915584. The cubic root of 131206617 is about 508.1421794458.

Adding to 131206617 its reverse (716602131), we get a palindrome (847808748).

The spelling of 131206617 in words is "one hundred thirty-one million, two hundred six thousand, six hundred seventeen".