131253505 has 8 divisors (see below), whose sum is σ = 161346024. Its totient is φ = 102441600.

The previous prime is 131253497. The next prime is 131253509. The reversal of 131253505 is 505352131.

It can be written as a sum of positive squares in 4 ways, for example, as 288369 + 130965136 = 537^2 + 11444^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131253505 - 2³ = 131253497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131253505.

It is not an unprimeable number, because it can be changed into a prime (131253509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319926 + ... + 320335.

It is an arithmetic number, because the mean of its divisors is an integer number (20168253).

Almost surely, 2^131253505 is an apocalyptic number.

It is an amenable number.

131253505 is a deficient number, since it is larger than the sum of its proper divisors (30092519).

131253505 is an equidigital number, since it uses as much as digits as its factorization.

131253505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640307.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 131253505 is about 11456.5922071094. The cubic root of 131253505 is about 508.2027021376.

The spelling of 131253505 in words is "one hundred thirty-one million, two hundred fifty-three thousand, five hundred five".