8635222261 has 2 divisors, whose sum is σ = 8635222262. Its totient is φ = 8635222260.

The previous prime is 8635222247. The next prime is 8635222313. The reversal of 8635222261 is 1622225368.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7036022161 + 1599200100 = 83881^2 + 39990^2 .

It is a cyclic number.

It is not a de Polignac number, because 8635222261 - 2¹⁷ = 8635091189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8635222261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8635262261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4317611130 + 4317611131.

It is an arithmetic number, because the mean of its divisors is an integer number (4317611131).

Almost surely, 2^8635222261 is an apocalyptic number.

It is an amenable number.

8635222261 is a deficient number, since it is larger than the sum of its proper divisors (1).

8635222261 is an equidigital number, since it uses as much as digits as its factorization.

8635222261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 37.

The square root of 8635222261 is about 92925.8966112246. The cubic root of 8635222261 is about 2051.5928339220.

The spelling of 8635222261 in words is "eight billion, six hundred thirty-five million, two hundred twenty-two thousand, two hundred sixty-one".