131530505 has 4 divisors (see below), whose sum is σ = 157836612. Its totient is φ = 105224400.

The previous prime is 131530493. The next prime is 131530561. The reversal of 131530505 is 505035131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 49519369 + 82011136 = 7037^2 + 9056^2 .

It is not a de Polignac number, because 131530505 - 2²⁰ = 130481929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13153046 + ... + 13153055.

It is an arithmetic number, because the mean of its divisors is an integer number (39459153).

Almost surely, 2^131530505 is an apocalyptic number.

It is an amenable number.

131530505 is a deficient number, since it is larger than the sum of its proper divisors (26306107).

131530505 is an equidigital number, since it uses as much as digits as its factorization.

131530505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26306106.

The product of its (nonzero) digits is 1125, while the sum is 23.

The square root of 131530505 is about 11468.6749452585. The cubic root of 131530505 is about 508.5599579559.

Adding to 131530505 its reverse (505035131), we get a palindrome (636565636).

It can be divided in two parts, 131 and 530505, that multiplied together give a triangular number (69496155 = T₁₁₇₈₉).

The spelling of 131530505 in words is "one hundred thirty-one million, five hundred thirty thousand, five hundred five".