131561471 has 4 divisors (see below), whose sum is σ = 131721000. Its totient is φ = 131401944.

The previous prime is 131561407. The next prime is 131561501. The reversal of 131561471 is 174165131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131561471 - 2⁶ = 131561407 is a prime.

It is a super-3 number, since 3×131561471³ (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 (131561071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78521 + ... + 80178.

It is an arithmetic number, because the mean of its divisors is an integer number (32930250).

Almost surely, 2^131561471 is an apocalyptic number.

131561471 is a deficient number, since it is larger than the sum of its proper divisors (159529).

131561471 is an equidigital number, since it uses as much as digits as its factorization.

131561471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159528.

The product of its digits is 2520, while the sum is 29.

The square root of 131561471 is about 11470.0248909930. The cubic root of 131561471 is about 508.5998646223.

The spelling of 131561471 in words is "one hundred thirty-one million, five hundred sixty-one thousand, four hundred seventy-one".