2511521 has 2 divisors, whose sum is σ = 2511522. Its totient is φ = 2511520.

The previous prime is 2511517. The next prime is 2511541. The reversal of 2511521 is 1251152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1290496 + 1221025 = 1136^2 + 1105^2 .

It is a cyclic number.

It is not a de Polignac number, because 2511521 - 2² = 2511517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2511521.

It is not a weakly prime, because it can be changed into another prime (2511541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1255760 + 1255761.

It is an arithmetic number, because the mean of its divisors is an integer number (1255761).

2^2511521 is an apocalyptic number.

It is an amenable number.

2511521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2511521 is an equidigital number, since it uses as much as digits as its factorization.

2511521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100, while the sum is 17.

The square root of 2511521 is about 1584.7779024204. Note that the first 3 decimals coincide. The cubic root of 2511521 is about 135.9290467549.

Adding to 2511521 its reverse (1251152), we get a palindrome (3762673).

The spelling of 2511521 in words is "two million, five hundred eleven thousand, five hundred twenty-one".