9865076981 has 4 divisors (see below), whose sum is σ = 9866400000. Its totient is φ = 9863753964.

The previous prime is 9865076971. The next prime is 9865076989. The reversal of 9865076981 is 1896705689.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1896705689 = 12329 ⋅153841.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9865076981 is a prime.

It is a super-2 number, since 2×9865076981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9865076981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9865076989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650261 + ... + 665258.

It is an arithmetic number, because the mean of its divisors is an integer number (2466600000).

Almost surely, 2^9865076981 is an apocalyptic number.

It is an amenable number.

9865076981 is a deficient number, since it is larger than the sum of its proper divisors (1323019).

9865076981 is a wasteful number, since it uses less digits than its factorization.

9865076981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323018.

The product of its (nonzero) digits is 6531840, while the sum is 59.

The square root of 9865076981 is about 99323.0938956293. The cubic root of 9865076981 is about 2144.7013551036.

The spelling of 9865076981 in words is "nine billion, eight hundred sixty-five million, seventy-six thousand, nine hundred eighty-one".