2531001521 has 8 divisors (see below), whose sum is σ = 2566691688. Its totient is φ = 2495520000.

The previous prime is 2531001439. The next prime is 2531001587. The reversal of 2531001521 is 1251001352.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1196122225 + 1334879296 = 34585^2 + 36536^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2531001521 - 2²⁶ = 2463892657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2531001493 and 2531001502.

It is not an unprimeable number, because it can be changed into a prime (2531001721) 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, 27650 + ... + 76331.

It is an arithmetic number, because the mean of its divisors is an integer number (320836461).

Almost surely, 2^2531001521 is an apocalyptic number.

It is an amenable number.

2531001521 is a deficient number, since it is larger than the sum of its proper divisors (35690167).

2531001521 is a wasteful number, since it uses less digits than its factorization.

2531001521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104323.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 2531001521 is about 50309.0600289848. The cubic root of 2531001521 is about 1362.7958489616.

Adding to 2531001521 its reverse (1251001352), we get a palindrome (3782002873).

The spelling of 2531001521 in words is "two billion, five hundred thirty-one million, one thousand, five hundred twenty-one".