2516312621 has 2 divisors, whose sum is σ = 2516312622. Its totient is φ = 2516312620.

The previous prime is 2516312593. The next prime is 2516312699. The reversal of 2516312621 is 1262136152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1300395721 + 1215916900 = 36061^2 + 34870^2 .

It is a cyclic number.

It is not a de Polignac number, because 2516312621 - 2²² = 2512118317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2516312521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1258156310 + 1258156311.

It is an arithmetic number, because the mean of its divisors is an integer number (1258156311).

Almost surely, 2^2516312621 is an apocalyptic number.

It is an amenable number.

2516312621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2516312621 is an equidigital number, since it uses as much as digits as its factorization.

2516312621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 2516312621 is about 50162.8609730346. The cubic root of 2516312621 is about 1360.1543619845.

Adding to 2516312621 its reverse (1262136152), we get a palindrome (3778448773).

The spelling of 2516312621 in words is "two billion, five hundred sixteen million, three hundred twelve thousand, six hundred twenty-one".