2516501521 has 2 divisors, whose sum is σ = 2516501522. Its totient is φ = 2516501520.

The previous prime is 2516501509. The next prime is 2516501543. The reversal of 2516501521 is 1251056152.

2516501521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2039515921 + 476985600 = 45161^2 + 21840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2516501521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2516501521.

It is not a weakly prime, because it can be changed into another prime (2516561521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1258250760 + 1258250761.

It is an arithmetic number, because the mean of its divisors is an integer number (1258250761).

Almost surely, 2^2516501521 is an apocalyptic number.

It is an amenable number.

2516501521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2516501521 is an equidigital number, since it uses as much as digits as its factorization.

2516501521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 2516501521 is about 50164.7438047878. The cubic root of 2516501521 is about 1360.1883968030.

Adding to 2516501521 its reverse (1251056152), we get a palindrome (3767557673).

The spelling of 2516501521 in words is "two billion, five hundred sixteen million, five hundred one thousand, five hundred twenty-one".