9864901981 has 8 divisors (see below), whose sum is σ = 10922334624. Its totient is φ = 8834239920.

The previous prime is 9864901961. The next prime is 9864901987. The reversal of 9864901981 is 1891094689.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9864901981 - 2¹³ = 9864893789 is a prime.

It is a super-2 number, since 2×9864901981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9864901987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6691870 + ... + 6693343.

It is an arithmetic number, because the mean of its divisors is an integer number (1365291828).

Almost surely, 2^9864901981 is an apocalyptic number.

It is an amenable number.

9864901981 is a deficient number, since it is larger than the sum of its proper divisors (1057432643).

9864901981 is a wasteful number, since it uses less digits than its factorization.

9864901981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13385291.

The product of its (nonzero) digits is 1119744, while the sum is 55.

The square root of 9864901981 is about 99322.2129284280. The cubic root of 9864901981 is about 2144.6886731632.

The spelling of 9864901981 in words is "nine billion, eight hundred sixty-four million, nine hundred one thousand, nine hundred eighty-one".