7782005321 has 2 divisors, whose sum is σ = 7782005322. Its totient is φ = 7782005320.

The previous prime is 7782005267. The next prime is 7782005327. The reversal of 7782005321 is 1235002877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7710771721 + 71233600 = 87811^2 + 8440^2 .

It is a cyclic number.

It is not a de Polignac number, because 7782005321 - 2²² = 7777811017 is a prime.

It is not a weakly prime, because it can be changed into another prime (7782005327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3891002660 + 3891002661.

It is an arithmetic number, because the mean of its divisors is an integer number (3891002661).

Almost surely, 2^7782005321 is an apocalyptic number.

It is an amenable number.

7782005321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7782005321 is an equidigital number, since it uses as much as digits as its factorization.

7782005321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 7782005321 is about 88215.6750300081. The cubic root of 7782005321 is about 1981.6662266678. Note that the first 3 decimals are identical.

The spelling of 7782005321 in words is "seven billion, seven hundred eighty-two million, five thousand, three hundred twenty-one".