8774729981 has 2 divisors, whose sum is σ = 8774729982. Its totient is φ = 8774729980.

The previous prime is 8774729947. The next prime is 8774729987. The reversal of 8774729981 is 1899274778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8528522500 + 246207481 = 92350^2 + 15691^2 .

It is a cyclic number.

It is not a de Polignac number, because 8774729981 - 2⁶ = 8774729917 is a prime.

It is a super-2 number, since 2×8774729981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8774729987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4387364990 + 4387364991.

It is an arithmetic number, because the mean of its divisors is an integer number (4387364991).

Almost surely, 2^8774729981 is an apocalyptic number.

It is an amenable number.

8774729981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8774729981 is an equidigital number, since it uses as much as digits as its factorization.

8774729981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14224896, while the sum is 62.

The square root of 8774729981 is about 93673.5287100897. The cubic root of 8774729981 is about 2062.5821439999.

The spelling of 8774729981 in words is "eight billion, seven hundred seventy-four million, seven hundred twenty-nine thousand, nine hundred eighty-one".