131857 has 4 divisors (see below), whose sum is σ = 143856. Its totient is φ = 119860.

The previous prime is 131849. The next prime is 131861. The reversal of 131857 is 758131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131857 - 2³ = 131849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5983 + ... + 6004.

It is an arithmetic number, because the mean of its divisors is an integer number (35964).

2¹³¹⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

131857 is a deficient number, since it is larger than the sum of its proper divisors (11999).

131857 is a wasteful number, since it uses less digits than its factorization.

131857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11998.

The product of its digits is 840, while the sum is 25.

The square root of 131857 is about 363.1211918905. The cubic root of 131857 is about 50.8980405631.

Adding to 131857 its reverse (758131), we get a palindrome (889988).

The spelling of 131857 in words is "one hundred thirty-one thousand, eight hundred fifty-seven".