2020131521 has 4 divisors (see below), whose sum is σ = 2020454100. Its totient is φ = 2019808944.

The previous prime is 2020131497. The next prime is 2020131527. The reversal of 2020131521 is 1251310202.

It is a happy number.

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 648466225 + 1371665296 = 25465^2 + 37036^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020131521 - 2⁶ = 2020131457 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 2020131521.

It is not an unprimeable number, because it can be changed into a prime (2020131527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151706 + ... + 164483.

It is an arithmetic number, because the mean of its divisors is an integer number (505113525).

Almost surely, 2^2020131521 is an apocalyptic number.

It is an amenable number.

2020131521 is a deficient number, since it is larger than the sum of its proper divisors (322579).

2020131521 is an equidigital number, since it uses as much as digits as its factorization.

2020131521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322578.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 2020131521 is about 44945.8732365943. The cubic root of 2020131521 is about 1264.1342993502.

Adding to 2020131521 its reverse (1251310202), we get a palindrome (3271441723).

The spelling of 2020131521 in words is "two billion, twenty million, one hundred thirty-one thousand, five hundred twenty-one".