8820009881 has 2 divisors, whose sum is σ = 8820009882. Its totient is φ = 8820009880.

The previous prime is 8820009871. The next prime is 8820009911. The reversal of 8820009881 is 1889000288.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7743120025 + 1076889856 = 87995^2 + 32816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8820009881 is a prime.

It is a super-2 number, since 2×8820009881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8820009851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4410004940 + 4410004941.

It is an arithmetic number, because the mean of its divisors is an integer number (4410004941).

Almost surely, 2^8820009881 is an apocalyptic number.

It is an amenable number.

8820009881 is a deficient number, since it is larger than the sum of its proper divisors (1).

8820009881 is an equidigital number, since it uses as much as digits as its factorization.

8820009881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 44.

The square root of 8820009881 is about 93914.9076611376. The cubic root of 8820009881 is about 2066.1238798484.

The spelling of 8820009881 in words is "eight billion, eight hundred twenty million, nine thousand, eight hundred eighty-one".