5257530781 has 2 divisors, whose sum is σ = 5257530782. Its totient is φ = 5257530780.

The previous prime is 5257530713. The next prime is 5257530791. The reversal of 5257530781 is 1870357525.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5036740900 + 220789881 = 70970^2 + 14859^2 .

It is a cyclic number.

It is not a de Polignac number, because 5257530781 - 2²¹ = 5255433629 is a prime.

It is a super-2 number, since 2×5257530781² = 55283259826324939922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5257530791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2628765390 + 2628765391.

It is an arithmetic number, because the mean of its divisors is an integer number (2628765391).

Almost surely, 2^5257530781 is an apocalyptic number.

It is an amenable number.

5257530781 is a deficient number, since it is larger than the sum of its proper divisors (1).

5257530781 is an equidigital number, since it uses as much as digits as its factorization.

5257530781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 294000, while the sum is 43.

The square root of 5257530781 is about 72508.8324344007. The cubic root of 5257530781 is about 1738.8439474873.

The spelling of 5257530781 in words is "five billion, two hundred fifty-seven million, five hundred thirty thousand, seven hundred eighty-one".