131669 has 4 divisors (see below), whose sum is σ = 132396. Its totient is φ = 130944.

The previous prime is 131641. The next prime is 131671. The reversal of 131669 is 966131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 966131 = 19 ⋅50849.

It can be written as a sum of positive squares in 2 ways, for example, as 62500 + 69169 = 250^2 + 263^2 .

It is a cyclic number.

It is not a de Polignac number, because 131669 - 2⁸ = 131413 is a prime.

It is a super-2 number, since 2×131669² = 34673451122, 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 (131639) 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, 167 + ... + 539.

It is an arithmetic number, because the mean of its divisors is an integer number (33099).

2¹³¹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

131669 is a deficient number, since it is larger than the sum of its proper divisors (727).

131669 is an equidigital number, since it uses as much as digits as its factorization.

131669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726.

The product of its digits is 972, while the sum is 26.

The square root of 131669 is about 362.8622328102. The cubic root of 131669 is about 50.8738391354.

The spelling of 131669 in words is "one hundred thirty-one thousand, six hundred sixty-nine".