131566 has 8 divisors (see below), whose sum is σ = 199080. Its totient is φ = 65208.

The previous prime is 131561. The next prime is 131581. The reversal of 131566 is 665131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×131566² = 34619224712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131561) 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, 105 + ... + 523.

It is an arithmetic number, because the mean of its divisors is an integer number (24885).

2¹³¹⁵⁶⁶ is an apocalyptic number.

131566 is a deficient number, since it is larger than the sum of its proper divisors (67514).

131566 is a wasteful number, since it uses less digits than its factorization.

131566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578.

The product of its digits is 540, while the sum is 22.

The square root of 131566 is about 362.7202779002. The cubic root of 131566 is about 50.8605700734.

Adding to 131566 its reverse (665131), we get a palindrome (796697).

The spelling of 131566 in words is "one hundred thirty-one thousand, five hundred sixty-six".