9855026981 has 2 divisors, whose sum is σ = 9855026982. Its totient is φ = 9855026980.

The previous prime is 9855026977. The next prime is 9855027047. The reversal of 9855026981 is 1896205589.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9853738756 + 1288225 = 99266^2 + 1135^2 .

It is a cyclic number.

It is not a de Polignac number, because 9855026981 - 2² = 9855026977 is a prime.

It is a super-2 number, since 2×9855026981² (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 (9855026971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4927513490 + 4927513491.

It is an arithmetic number, because the mean of its divisors is an integer number (4927513491).

Almost surely, 2^9855026981 is an apocalyptic number.

It is an amenable number.

9855026981 is a deficient number, since it is larger than the sum of its proper divisors (1).

9855026981 is an equidigital number, since it uses as much as digits as its factorization.

9855026981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555200, while the sum is 53.

The square root of 9855026981 is about 99272.4885403806. The cubic root of 9855026981 is about 2143.9728062291.

The spelling of 9855026981 in words is "nine billion, eight hundred fifty-five million, twenty-six thousand, nine hundred eighty-one".