7478449409 has 2 divisors, whose sum is σ = 7478449410. Its totient is φ = 7478449408.

The previous prime is 7478449403. The next prime is 7478449423. The reversal of 7478449409 is 9049448747.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7469280625 + 9168784 = 86425^2 + 3028^2 .

It is an emirp because it is prime and its reverse (9049448747) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7478449409 is a prime.

It is not a weakly prime, because it can be changed into another prime (7478449403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3739224704 + 3739224705.

It is an arithmetic number, because the mean of its divisors is an integer number (3739224705).

Almost surely, 2^7478449409 is an apocalyptic number.

It is an amenable number.

7478449409 is a deficient number, since it is larger than the sum of its proper divisors (1).

7478449409 is an equidigital number, since it uses as much as digits as its factorization.

7478449409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8128512, while the sum is 56.

The square root of 7478449409 is about 86478.0284754457. The cubic root of 7478449409 is about 1955.5571839548.

The spelling of 7478449409 in words is "seven billion, four hundred seventy-eight million, four hundred forty-nine thousand, four hundred nine".