131961 has 4 divisors (see below), whose sum is σ = 175952. Its totient is φ = 87972.

The previous prime is 131959. The next prime is 131969. The reversal of 131961 is 169131.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 169131 = 3 ⋅56377.

It is not a de Polignac number, because 131961 - 2¹ = 131959 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21991 + ... + 21996.

It is an arithmetic number, because the mean of its divisors is an integer number (43988).

2¹³¹⁹⁶¹ is an apocalyptic number.

It is an amenable number.

131961 is a deficient number, since it is larger than the sum of its proper divisors (43991).

131961 is an equidigital number, since it uses as much as digits as its factorization.

131961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43990.

The product of its digits is 162, while the sum is 21.

The square root of 131961 is about 363.2643665432. The cubic root of 131961 is about 50.9114187054.

The spelling of 131961 in words is "one hundred thirty-one thousand, nine hundred sixty-one".