9978331841 has 4 divisors (see below), whose sum is σ = 9984990000. Its totient is φ = 9971673684.

The previous prime is 9978331813. The next prime is 9978331879. The reversal of 9978331841 is 1481338799.

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.

It is a cyclic number.

It is not a de Polignac number, because 9978331841 - 2²⁶ = 9911222977 is a prime.

It is a super-2 number, since 2×9978331841² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9978337841) 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, 3326831 + ... + 3329828.

It is an arithmetic number, because the mean of its divisors is an integer number (2496247500).

Almost surely, 2^9978331841 is an apocalyptic number.

It is an amenable number.

9978331841 is a deficient number, since it is larger than the sum of its proper divisors (6658159).

9978331841 is a wasteful number, since it uses less digits than its factorization.

9978331841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6658158.

The product of its digits is 1306368, while the sum is 53.

The square root of 9978331841 is about 99891.6004526907. The cubic root of 9978331841 is about 2152.8774769778.

The spelling of 9978331841 in words is "nine billion, nine hundred seventy-eight million, three hundred thirty-one thousand, eight hundred forty-one".