7745282921 has 2 divisors, whose sum is σ = 7745282922. Its totient is φ = 7745282920.

The previous prime is 7745282893. The next prime is 7745282933. The reversal of 7745282921 is 1292825477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7020596521 + 724686400 = 83789^2 + 26920^2 .

It is an emirp because it is prime and its reverse (1292825477) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7745282921 is a prime.

It is not a weakly prime, because it can be changed into another prime (7745282971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3872641460 + 3872641461.

It is an arithmetic number, because the mean of its divisors is an integer number (3872641461).

Almost surely, 2^7745282921 is an apocalyptic number.

It is an amenable number.

7745282921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7745282921 is an equidigital number, since it uses as much as digits as its factorization.

7745282921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 47.

The square root of 7745282921 is about 88007.2890219895. The cubic root of 7745282921 is about 1978.5442247009.

The spelling of 7745282921 in words is "seven billion, seven hundred forty-five million, two hundred eighty-two thousand, nine hundred twenty-one".