8621985061 has 2 divisors, whose sum is σ = 8621985062. Its totient is φ = 8621985060.

The previous prime is 8621985059. The next prime is 8621985107. The reversal of 8621985061 is 1605891268.

8621985061 = T₇₅₈₁₄ + T₇₅₈₁₅ + T₇₅₈₁₆.

It is an a-pointer prime, because the next prime (8621985107) can be obtained adding 8621985061 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8097300225 + 524684836 = 89985^2 + 22906^2 .

It is a cyclic number.

It is not a de Polignac number, because 8621985061 - 2¹ = 8621985059 is a prime.

Together with 8621985059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8621985461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4310992530 + 4310992531.

It is an arithmetic number, because the mean of its divisors is an integer number (4310992531).

Almost surely, 2^8621985061 is an apocalyptic number.

8621985061 is the 75816-th centered triangular number.

It is an amenable number.

8621985061 is a deficient number, since it is larger than the sum of its proper divisors (1).

8621985061 is an equidigital number, since it uses as much as digits as its factorization.

8621985061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 8621985061 is about 92854.6448003545. The cubic root of 8621985061 is about 2050.5439810398.

The spelling of 8621985061 in words is "eight billion, six hundred twenty-one million, nine hundred eighty-five thousand, sixty-one".