131671569 has 4 divisors (see below), whose sum is σ = 175562096. Its totient is φ = 87781044.

The previous prime is 131671543. The next prime is 131671597. The reversal of 131671569 is 965176131.

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.

It is not a de Polignac number, because 131671569 - 2⁵ = 131671537 is a prime.

It is a super-2 number, since 2×131671569² = 34674804165843522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131671369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21945259 + ... + 21945264.

It is an arithmetic number, because the mean of its divisors is an integer number (43890524).

Almost surely, 2^131671569 is an apocalyptic number.

It is an amenable number.

131671569 is a deficient number, since it is larger than the sum of its proper divisors (43890527).

131671569 is an equidigital number, since it uses as much as digits as its factorization.

131671569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43890526.

The product of its digits is 34020, while the sum is 39.

The square root of 131671569 is about 11474.8232666129. The cubic root of 131671569 is about 508.7417000057.

The spelling of 131671569 in words is "one hundred thirty-one million, six hundred seventy-one thousand, five hundred sixty-nine".