7747426121 has 2 divisors, whose sum is σ = 7747426122. Its totient is φ = 7747426120.

The previous prime is 7747426117. The next prime is 7747426171. The reversal of 7747426121 is 1216247477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4878324025 + 2869102096 = 69845^2 + 53564^2 .

It is an emirp because it is prime and its reverse (1216247477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7747426121 - 2² = 7747426117 is a prime.

It is a super-2 number, since 2×7747426121² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7747426171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3873713060 + 3873713061.

It is an arithmetic number, because the mean of its divisors is an integer number (3873713061).

Almost surely, 2^7747426121 is an apocalyptic number.

It is an amenable number.

7747426121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7747426121 is an equidigital number, since it uses as much as digits as its factorization.

7747426121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131712, while the sum is 41.

The square root of 7747426121 is about 88019.4644439513. The cubic root of 7747426121 is about 1978.7267024301.

The spelling of 7747426121 in words is "seven billion, seven hundred forty-seven million, four hundred twenty-six thousand, one hundred twenty-one".