131445471 has 4 divisors (see below), whose sum is σ = 175260632. Its totient is φ = 87630312.

The previous prime is 131445463. The next prime is 131445473. The reversal of 131445471 is 174544131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 174544131 = 3 ⋅58181377.

It is not a de Polignac number, because 131445471 - 2³ = 131445463 is a prime.

It is a super-3 number, since 3×131445471³ (a number of 25 digits) contains 333 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 (131445473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21907576 + ... + 21907581.

It is an arithmetic number, because the mean of its divisors is an integer number (43815158).

Almost surely, 2^131445471 is an apocalyptic number.

131445471 is a deficient number, since it is larger than the sum of its proper divisors (43815161).

131445471 is an equidigital number, since it uses as much as digits as its factorization.

131445471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43815160.

The product of its digits is 6720, while the sum is 30.

The square root of 131445471 is about 11464.9671172664. The cubic root of 131445471 is about 508.4503402667.

The spelling of 131445471 in words is "one hundred thirty-one million, four hundred forty-five thousand, four hundred seventy-one".