131710861 has 4 divisors (see below), whose sum is σ = 135270652. Its totient is φ = 128151072.

The previous prime is 131710853. The next prime is 131710871. The reversal of 131710861 is 168017131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 168017131 = 269 ⋅624599.

It can be written as a sum of positive squares in 2 ways, for example, as 98128836 + 33582025 = 9906^2 + 5795^2 .

It is a cyclic number.

It is not a de Polignac number, because 131710861 - 2³ = 131710853 is a prime.

It is a super-2 number, since 2×131710861² = 34695501810722642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131710801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1779840 + ... + 1779913.

It is an arithmetic number, because the mean of its divisors is an integer number (33817663).

Almost surely, 2^131710861 is an apocalyptic number.

It is an amenable number.

131710861 is a deficient number, since it is larger than the sum of its proper divisors (3559791).

131710861 is an equidigital number, since it uses as much as digits as its factorization.

131710861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3559790.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 131710861 is about 11476.5352349914. The cubic root of 131710861 is about 508.7922993644.

Adding to 131710861 its reverse (168017131), we get a palindrome (299727992).

The spelling of 131710861 in words is "one hundred thirty-one million, seven hundred ten thousand, eight hundred sixty-one".