131520121300501 has 4 divisors (see below), whose sum is σ = 136055297897100. Its totient is φ = 126984944703904.

The previous prime is 131520121300459. The next prime is 131520121300531. The reversal of 131520121300501 is 105003121025131.

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 41205794842276 + 90314326458225 = 6419174^2 + 9503385^2 .

It is a cyclic number.

It is not a de Polignac number, because 131520121300501 - 2⁹ = 131520121299989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131520121300531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2267588298256 + ... + 2267588298313.

It is an arithmetic number, because the mean of its divisors is an integer number (34013824474275).

Almost surely, 2^{131520121300501} is an apocalyptic number.

It is an amenable number.

131520121300501 is a deficient number, since it is larger than the sum of its proper divisors (4535176596599).

131520121300501 is an equidigital number, since it uses as much as digits as its factorization.

131520121300501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4535176596598.

The product of its (nonzero) digits is 900, while the sum is 25.

Adding to 131520121300501 its reverse (105003121025131), we get a palindrome (236523242325632).

The spelling of 131520121300501 in words is "one hundred thirty-one trillion, five hundred twenty billion, one hundred twenty-one million, three hundred thousand, five hundred one".