8253812561 has 2 divisors, whose sum is σ = 8253812562. Its totient is φ = 8253812560.

The previous prime is 8253812543. The next prime is 8253812569. The reversal of 8253812561 is 1652183528.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5752312336 + 2501500225 = 75844^2 + 50015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8253812561 is a prime.

It is a super-3 number, since 3×8253812561³ (a number of 31 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (8253812569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4126906280 + 4126906281.

It is an arithmetic number, because the mean of its divisors is an integer number (4126906281).

Almost surely, 2^8253812561 is an apocalyptic number.

It is an amenable number.

8253812561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8253812561 is an equidigital number, since it uses as much as digits as its factorization.

8253812561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 41.

The square root of 8253812561 is about 90850.4956563254. The cubic root of 8253812561 is about 2020.9312244786.

The spelling of 8253812561 in words is "eight billion, two hundred fifty-three million, eight hundred twelve thousand, five hundred sixty-one".