9979641401 has 2 divisors, whose sum is σ = 9979641402. Its totient is φ = 9979641400.

The previous prime is 9979641383. The next prime is 9979641433. The reversal of 9979641401 is 1041469799.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7534240000 + 2445401401 = 86800^2 + 49451^2 .

It is a cyclic number.

It is not a de Polignac number, because 9979641401 - 2⁶ = 9979641337 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9979641401.

It is not a weakly prime, because it can be changed into another prime (9979641481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989820700 + 4989820701.

It is an arithmetic number, because the mean of its divisors is an integer number (4989820701).

Almost surely, 2^9979641401 is an apocalyptic number.

It is an amenable number.

9979641401 is a deficient number, since it is larger than the sum of its proper divisors (1).

9979641401 is an equidigital number, since it uses as much as digits as its factorization.

9979641401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 9979641401 is about 99898.1551431256. The cubic root of 9979641401 is about 2152.9716543395.

The spelling of 9979641401 in words is "nine billion, nine hundred seventy-nine million, six hundred forty-one thousand, four hundred one".