7916421089 has 2 divisors, whose sum is σ = 7916421090. Its totient is φ = 7916421088.

The previous prime is 7916421067. The next prime is 7916421143. The reversal of 7916421089 is 9801246197.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5232352225 + 2684068864 = 72335^2 + 51808^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7916421089 is a prime.

It is not a weakly prime, because it can be changed into another prime (7916421049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3958210544 + 3958210545.

It is an arithmetic number, because the mean of its divisors is an integer number (3958210545).

Almost surely, 2^7916421089 is an apocalyptic number.

It is an amenable number.

7916421089 is a deficient number, since it is larger than the sum of its proper divisors (1).

7916421089 is an equidigital number, since it uses as much as digits as its factorization.

7916421089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 7916421089 is about 88974.2720622091. The cubic root of 7916421089 is about 1993.0106940034.

The spelling of 7916421089 in words is "seven billion, nine hundred sixteen million, four hundred twenty-one thousand, eighty-nine".