131321155505 has 8 divisors (see below), whose sum is σ = 157588534824. Its totient is φ = 105054825600.

The previous prime is 131321155477. The next prime is 131321155507. The reversal of 131321155505 is 505551123131.

It can be written as a sum of positive squares in 4 ways, for example, as 60815505664 + 70505649841 = 246608^2 + 265529^2 .

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

It is not a de Polignac number, because 131321155505 - 2³² = 127026188209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131321155507) 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, 45875 + ... + 514535.

It is an arithmetic number, because the mean of its divisors is an integer number (19698566853).

Almost surely, 2^131321155505 is an apocalyptic number.

It is an amenable number.

131321155505 is a deficient number, since it is larger than the sum of its proper divisors (26267379319).

131321155505 is an equidigital number, since it uses as much as digits as its factorization.

131321155505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524707.

The product of its (nonzero) digits is 11250, while the sum is 32.

Adding to 131321155505 its reverse (505551123131), we get a palindrome (636872278636).

The spelling of 131321155505 in words is "one hundred thirty-one billion, three hundred twenty-one million, one hundred fifty-five thousand, five hundred five".