7651841261 has 2 divisors, whose sum is σ = 7651841262. Its totient is φ = 7651841260.

The previous prime is 7651841237. The next prime is 7651841317. The reversal of 7651841261 is 1621481567.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7461677161 + 190164100 = 86381^2 + 13790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7651841261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7651841161) 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, 3825920630 + 3825920631.

It is an arithmetic number, because the mean of its divisors is an integer number (3825920631).

Almost surely, 2^7651841261 is an apocalyptic number.

It is an amenable number.

7651841261 is a deficient number, since it is larger than the sum of its proper divisors (1).

7651841261 is an equidigital number, since it uses as much as digits as its factorization.

7651841261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 41.

The square root of 7651841261 is about 87474.8035779447. The cubic root of 7651841261 is about 1970.5554070559. Note that the first 3 decimals are identical.

The spelling of 7651841261 in words is "seven billion, six hundred fifty-one million, eight hundred forty-one thousand, two hundred sixty-one".