9869584981 has 2 divisors, whose sum is σ = 9869584982. Its totient is φ = 9869584980.

The previous prime is 9869584951. The next prime is 9869584997. The reversal of 9869584981 is 1894859689.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6199042756 + 3670542225 = 78734^2 + 60585^2 .

It is an emirp because it is prime and its reverse (1894859689) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9869584981 - 2²⁵ = 9836030549 is a prime.

It is a super-2 number, since 2×9869584981² (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 (9869584951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4934792490 + 4934792491.

It is an arithmetic number, because the mean of its divisors is an integer number (4934792491).

Almost surely, 2^9869584981 is an apocalyptic number.

It is an amenable number.

9869584981 is a deficient number, since it is larger than the sum of its proper divisors (1).

9869584981 is an equidigital number, since it uses as much as digits as its factorization.

9869584981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44789760, while the sum is 67.

The square root of 9869584981 is about 99345.7849181333. The cubic root of 9869584981 is about 2145.0279902093.

The spelling of 9869584981 in words is "nine billion, eight hundred sixty-nine million, five hundred eighty-four thousand, nine hundred eighty-one".