7721441069 has 2 divisors, whose sum is σ = 7721441070. Its totient is φ = 7721441068.

The previous prime is 7721441059. The next prime is 7721441099. The reversal of 7721441069 is 9601441277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7702344169 + 19096900 = 87763^2 + 4370^2 .

It is an emirp because it is prime and its reverse (9601441277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7721441069 - 2²⁸ = 7453005613 is a prime.

It is a super-2 number, since 2×7721441069² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7721441009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3860720534 + 3860720535.

It is an arithmetic number, because the mean of its divisors is an integer number (3860720535).

Almost surely, 2^7721441069 is an apocalyptic number.

It is an amenable number.

7721441069 is a deficient number, since it is larger than the sum of its proper divisors (1).

7721441069 is an equidigital number, since it uses as much as digits as its factorization.

7721441069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 7721441069 is about 87871.7307727576. The cubic root of 7721441069 is about 1976.5119923326.

The spelling of 7721441069 in words is "seven billion, seven hundred twenty-one million, four hundred forty-one thousand, sixty-nine".