131645752521 has 4 divisors (see below), whose sum is σ = 175527670032. Its totient is φ = 87763835012.

The previous prime is 131645752493. The next prime is 131645752541. The reversal of 131645752521 is 125257546131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131645752521 - 2⁶ = 131645752457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131645752541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21940958751 + ... + 21940958756.

It is an arithmetic number, because the mean of its divisors is an integer number (43881917508).

Almost surely, 2^131645752521 is an apocalyptic number.

It is an amenable number.

131645752521 is a deficient number, since it is larger than the sum of its proper divisors (43881917511).

131645752521 is an equidigital number, since it uses as much as digits as its factorization.

131645752521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43881917510.

The product of its digits is 252000, while the sum is 42.

The spelling of 131645752521 in words is "one hundred thirty-one billion, six hundred forty-five million, seven hundred fifty-two thousand, five hundred twenty-one".