9979641397 has 16 divisors (see below), whose sum is σ = 11006315712. Its totient is φ = 8972997120.

The previous prime is 9979641383. The next prime is 9979641401. The reversal of 9979641397 is 7931469799.

It is a cyclic number.

It is not a de Polignac number, because 9979641397 - 2²³ = 9971252789 is a prime.

It is a super-3 number, since 3×9979641397³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9979641337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3153538 + ... + 3156700.

It is an arithmetic number, because the mean of its divisors is an integer number (687894732).

Almost surely, 2^9979641397 is an apocalyptic number.

9979641397 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

It is an amenable number.

9979641397 is a deficient number, since it is larger than the sum of its proper divisors (1026674315).

9979641397 is a wasteful number, since it uses less digits than its factorization.

9979641397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6228.

The product of its digits is 23147208, while the sum is 64.

The square root of 9979641397 is about 99898.1551231053. The cubic root of 9979641397 is about 2152.9716540518.

The spelling of 9979641397 in words is "nine billion, nine hundred seventy-nine million, six hundred forty-one thousand, three hundred ninety-seven".