131611261 has 8 divisors (see below), whose sum is σ = 134871264. Its totient is φ = 128360400.

The previous prime is 131611247. The next prime is 131611273. The reversal of 131611261 is 162116131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131611261 - 2⁷ = 131611133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131611231) 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 7 ways as a sum of consecutive naturals, for example, 33711 + ... + 37411.

It is an arithmetic number, because the mean of its divisors is an integer number (16858908).

Almost surely, 2^131611261 is an apocalyptic number.

It is an amenable number.

131611261 is a deficient number, since it is larger than the sum of its proper divisors (3260003).

131611261 is an equidigital number, since it uses as much as digits as its factorization.

131611261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4571.

The product of its digits is 216, while the sum is 22.

The square root of 131611261 is about 11472.1951256070. The cubic root of 131611261 is about 508.6640171263.

Adding to 131611261 its reverse (162116131), we get a palindrome (293727392).

The spelling of 131611261 in words is "one hundred thirty-one million, six hundred eleven thousand, two hundred sixty-one".