52131551621 has 2 divisors, whose sum is σ = 52131551622. Its totient is φ = 52131551620.

The previous prime is 52131551597. The next prime is 52131551627. The reversal of 52131551621 is 12615513125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44508340900 + 7623210721 = 210970^2 + 87311^2 .

It is a cyclic number.

It is not a de Polignac number, because 52131551621 - 2³⁰ = 51057809797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52131551627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26065775810 + 26065775811.

It is an arithmetic number, because the mean of its divisors is an integer number (26065775811).

Almost surely, 2^52131551621 is an apocalyptic number.

It is an amenable number.

52131551621 is a deficient number, since it is larger than the sum of its proper divisors (1).

52131551621 is an equidigital number, since it uses as much as digits as its factorization.

52131551621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 32.

The spelling of 52131551621 in words is "fifty-two billion, one hundred thirty-one million, five hundred fifty-one thousand, six hundred twenty-one".