9979126369 has 2 divisors, whose sum is σ = 9979126370. Its totient is φ = 9979126368.

The previous prime is 9979126351. The next prime is 9979126373. The reversal of 9979126369 is 9636219799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7428371344 + 2550755025 = 86188^2 + 50505^2 .

It is a cyclic number.

It is not a de Polignac number, because 9979126369 - 2³³ = 1389191777 is a prime.

It is a super-2 number, since 2×9979126369² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9979126319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989563184 + 4989563185.

It is an arithmetic number, because the mean of its divisors is an integer number (4989563185).

Almost surely, 2^9979126369 is an apocalyptic number.

It is an amenable number.

9979126369 is a deficient number, since it is larger than the sum of its proper divisors (1).

9979126369 is an equidigital number, since it uses as much as digits as its factorization.

9979126369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9920232, while the sum is 61.

The square root of 9979126369 is about 99895.5773245242. The cubic root of 9979126369 is about 2152.9346166569.

The spelling of 9979126369 in words is "nine billion, nine hundred seventy-nine million, one hundred twenty-six thousand, three hundred sixty-nine".