2521531 has 4 divisors (see below), whose sum is σ = 2530912. Its totient is φ = 2512152.

The previous prime is 2521517. The next prime is 2521537. The reversal of 2521531 is 1351252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2521531 - 2⁵ = 2521499 is a prime.

It is a super-3 number, since 3×2521531³ = 48096579333401292873, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 2521499 and 2521508.

It is not an unprimeable number, because it can be changed into a prime (2521537) 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, 4275 + ... + 4828.

It is an arithmetic number, because the mean of its divisors is an integer number (632728).

2^2521531 is an apocalyptic number.

2521531 is a deficient number, since it is larger than the sum of its proper divisors (9381).

2521531 is an equidigital number, since it uses as much as digits as its factorization.

2521531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9380.

The product of its digits is 300, while the sum is 19.

The square root of 2521531 is about 1587.9329330926. The cubic root of 2521531 is about 136.1093951131.

Adding to 2521531 its reverse (1351252), we get a palindrome (3872783).

The spelling of 2521531 in words is "two million, five hundred twenty-one thousand, five hundred thirty-one".