2516440621 has 2 divisors, whose sum is σ = 2516440622. Its totient is φ = 2516440620.

The previous prime is 2516440607. The next prime is 2516440681. The reversal of 2516440621 is 1260446152.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2299202500 + 217238121 = 47950^2 + 14739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2516440621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2516440681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1258220310 + 1258220311.

It is an arithmetic number, because the mean of its divisors is an integer number (1258220311).

Almost surely, 2^2516440621 is an apocalyptic number.

It is an amenable number.

2516440621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2516440621 is an equidigital number, since it uses as much as digits as its factorization.

2516440621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 2516440621 is about 50164.1368011052. The cubic root of 2516440621 is about 1360.1774244086.

Adding to 2516440621 its reverse (1260446152), we get a palindrome (3776886773).

The spelling of 2516440621 in words is "two billion, five hundred sixteen million, four hundred forty thousand, six hundred twenty-one".