8105651261 has 2 divisors, whose sum is σ = 8105651262. Its totient is φ = 8105651260.

The previous prime is 8105651233. The next prime is 8105651263. The reversal of 8105651261 is 1621565018.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4175615161 + 3930036100 = 64619^2 + 62690^2 .

It is a cyclic number.

It is not a de Polignac number, because 8105651261 - 2¹⁰ = 8105650237 is a prime.

Together with 8105651263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8105651263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4052825630 + 4052825631.

It is an arithmetic number, because the mean of its divisors is an integer number (4052825631).

Almost surely, 2^8105651261 is an apocalyptic number.

It is an amenable number.

8105651261 is a deficient number, since it is larger than the sum of its proper divisors (1).

8105651261 is an equidigital number, since it uses as much as digits as its factorization.

8105651261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 8105651261 is about 90031.3904202307. The cubic root of 8105651261 is about 2008.7657960303.

The spelling of 8105651261 in words is "eight billion, one hundred five million, six hundred fifty-one thousand, two hundred sixty-one".