8125810531 has 2 divisors, whose sum is σ = 8125810532. Its totient is φ = 8125810530.

The previous prime is 8125810523. The next prime is 8125810543. The reversal of 8125810531 is 1350185218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8125810531 - 2³ = 8125810523 is a prime.

It is a super-2 number, since 2×8125810531² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8125810831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4062905265 + 4062905266.

It is an arithmetic number, because the mean of its divisors is an integer number (4062905266).

Almost surely, 2^8125810531 is an apocalyptic number.

8125810531 is a deficient number, since it is larger than the sum of its proper divisors (1).

8125810531 is an equidigital number, since it uses as much as digits as its factorization.

8125810531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 34.

The square root of 8125810531 is about 90143.2777915248. The cubic root of 8125810531 is about 2010.4297267716.

Adding to 8125810531 its reverse (1350185218), we get a palindrome (9475995749).

The spelling of 8125810531 in words is "eight billion, one hundred twenty-five million, eight hundred ten thousand, five hundred thirty-one".