5125313621 has 2 divisors, whose sum is σ = 5125313622. Its totient is φ = 5125313620.

The previous prime is 5125313617. The next prime is 5125313639. The reversal of 5125313621 is 1263135215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5085686596 + 39627025 = 71314^2 + 6295^2 .

It is a cyclic number.

It is not a de Polignac number, because 5125313621 - 2² = 5125313617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5125313651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2562656810 + 2562656811.

It is an arithmetic number, because the mean of its divisors is an integer number (2562656811).

Almost surely, 2^5125313621 is an apocalyptic number.

It is an amenable number.

5125313621 is a deficient number, since it is larger than the sum of its proper divisors (1).

5125313621 is an equidigital number, since it uses as much as digits as its factorization.

5125313621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 29.

The square root of 5125313621 is about 71591.2957069503. The cubic root of 5125313621 is about 1724.1437880379.

Adding to 5125313621 its reverse (1263135215), we get a palindrome (6388448836).

The spelling of 5125313621 in words is "five billion, one hundred twenty-five million, three hundred thirteen thousand, six hundred twenty-one".