9879913261 has 2 divisors, whose sum is σ = 9879913262. Its totient is φ = 9879913260.

The previous prime is 9879913157. The next prime is 9879913283. The reversal of 9879913261 is 1623199789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8929116036 + 950797225 = 94494^2 + 30835^2 .

It is a cyclic number.

It is not a de Polignac number, because 9879913261 - 2⁷ = 9879913133 is a prime.

It is a super-2 number, since 2×9879913261² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9879913291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4939956630 + 4939956631.

It is an arithmetic number, because the mean of its divisors is an integer number (4939956631).

Almost surely, 2^9879913261 is an apocalyptic number.

It is an amenable number.

9879913261 is a deficient number, since it is larger than the sum of its proper divisors (1).

9879913261 is an equidigital number, since it uses as much as digits as its factorization.

9879913261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 55.

The square root of 9879913261 is about 99397.7527965296. The cubic root of 9879913261 is about 2145.7759691835.

The spelling of 9879913261 in words is "nine billion, eight hundred seventy-nine million, nine hundred thirteen thousand, two hundred sixty-one".