7841965121 has 2 divisors, whose sum is σ = 7841965122. Its totient is φ = 7841965120.

The previous prime is 7841965093. The next prime is 7841965249. The reversal of 7841965121 is 1215691487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5473780225 + 2368184896 = 73985^2 + 48664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7841965121 is a prime.

It is a super-2 number, since 2×7841965121² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7841965421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3920982560 + 3920982561.

It is an arithmetic number, because the mean of its divisors is an integer number (3920982561).

Almost surely, 2^7841965121 is an apocalyptic number.

It is an amenable number.

7841965121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7841965121 is an equidigital number, since it uses as much as digits as its factorization.

7841965121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 44.

The square root of 7841965121 is about 88554.8706791445. The cubic root of 7841965121 is about 1986.7427434939.

The spelling of 7841965121 in words is "seven billion, eight hundred forty-one million, nine hundred sixty-five thousand, one hundred twenty-one".