131531535 has 24 divisors (see below), whose sum is σ = 228490704. Its totient is φ = 69995520.

The previous prime is 131531489. The next prime is 131531557. The reversal of 131531535 is 535135131.

131531535 is a `hidden beast` number, since 1 + 315 + 315 + 35 = 666.

It is not a de Polignac number, because 131531535 - 2¹² = 131527439 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 131531499 and 131531508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19119 + ... + 25071.

It is an arithmetic number, because the mean of its divisors is an integer number (9520446).

Almost surely, 2^131531535 is an apocalyptic number.

131531535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

131531535 is a deficient number, since it is larger than the sum of its proper divisors (96959169).

131531535 is a wasteful number, since it uses less digits than its factorization.

131531535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6455 (or 6452 counting only the distinct ones).

The product of its digits is 3375, while the sum is 27.

The square root of 131531535 is about 11468.7198500966. The cubic root of 131531535 is about 508.5612854436.

Adding to 131531535 its reverse (535135131), we get a palindrome (666666666).

The spelling of 131531535 in words is "one hundred thirty-one million, five hundred thirty-one thousand, five hundred thirty-five".