8879121761 has 2 divisors, whose sum is σ = 8879121762. Its totient is φ = 8879121760.

The previous prime is 8879121683. The next prime is 8879121791. The reversal of 8879121761 is 1671219788.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7679192161 + 1199929600 = 87631^2 + 34640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8879121761 is a prime.

It is a super-2 number, since 2×8879121761² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8879121791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4439560880 + 4439560881.

It is an arithmetic number, because the mean of its divisors is an integer number (4439560881).

Almost surely, 2^8879121761 is an apocalyptic number.

It is an amenable number.

8879121761 is a deficient number, since it is larger than the sum of its proper divisors (1).

8879121761 is an equidigital number, since it uses as much as digits as its factorization.

8879121761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 50.

The square root of 8879121761 is about 94229.0919037215. The cubic root of 8879121761 is about 2070.7293408074.

The spelling of 8879121761 in words is "eight billion, eight hundred seventy-nine million, one hundred twenty-one thousand, seven hundred sixty-one".