131531505 has 16 divisors (see below), whose sum is σ = 240514944. Its totient is φ = 60128640.

The previous prime is 131531489. The next prime is 131531557. The reversal of 131531505 is 505135131.

It is not a de Polignac number, because 131531505 - 2⁴ = 131531489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 626236 + ... + 626445.

It is an arithmetic number, because the mean of its divisors is an integer number (15032184).

Almost surely, 2^131531505 is an apocalyptic number.

131531505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131531505 is a deficient number, since it is larger than the sum of its proper divisors (108983439).

131531505 is a wasteful number, since it uses less digits than its factorization.

131531505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252696.

The product of its (nonzero) digits is 1125, while the sum is 24.

The square root of 131531505 is about 11468.7185421912. The cubic root of 131531505 is about 508.5612467790.

Adding to 131531505 its reverse (505135131), we get a palindrome (636666636).

The spelling of 131531505 in words is "one hundred thirty-one million, five hundred thirty-one thousand, five hundred five".