131897 has 4 divisors (see below), whose sum is σ = 135156. Its totient is φ = 128640.

The previous prime is 131893. The next prime is 131899. The reversal of 131897 is 798131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59536 + 72361 = 244^2 + 269^2 .

It is a cyclic number.

It is not a de Polignac number, because 131897 - 2² = 131893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1568 + ... + 1649.

It is an arithmetic number, because the mean of its divisors is an integer number (33789).

2¹³¹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

131897 is a deficient number, since it is larger than the sum of its proper divisors (3259).

131897 is an equidigital number, since it uses as much as digits as its factorization.

131897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3258.

The product of its digits is 1512, while the sum is 29.

The square root of 131897 is about 363.1762657443. The cubic root of 131897 is about 50.9031868346.

The spelling of 131897 in words is "one hundred thirty-one thousand, eight hundred ninety-seven".