131565541 has 4 divisors (see below), whose sum is σ = 133150752. Its totient is φ = 129980332.

The previous prime is 131565521. The next prime is 131565563. The reversal of 131565541 is 145565131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 145565131 = 113 ⋅1288187.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131565541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131565521) 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, 792481 + ... + 792646.

It is an arithmetic number, because the mean of its divisors is an integer number (33287688).

Almost surely, 2^131565541 is an apocalyptic number.

It is an amenable number.

131565541 is a deficient number, since it is larger than the sum of its proper divisors (1585211).

131565541 is an equidigital number, since it uses as much as digits as its factorization.

131565541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585210.

The product of its digits is 9000, while the sum is 31.

The square root of 131565541 is about 11470.2023085907. The cubic root of 131565541 is about 508.6051092685.

The spelling of 131565541 in words is "one hundred thirty-one million, five hundred sixty-five thousand, five hundred forty-one".