7981246409 has 4 divisors (see below), whose sum is σ = 8010916740. Its totient is φ = 7951576080.

The previous prime is 7981246369. The next prime is 7981246433. The reversal of 7981246409 is 9046421897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9046421897 = 167 ⋅54170191.

It can be written as a sum of positive squares in 2 ways, for example, as 1299818809 + 6681427600 = 36053^2 + 81740^2 .

It is a cyclic number.

It is not a de Polignac number, because 7981246409 - 2²⁰ = 7980197833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7981246459) 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 in 3 ways as a sum of consecutive naturals, for example, 14834762 + ... + 14835299.

It is an arithmetic number, because the mean of its divisors is an integer number (2002729185).

Almost surely, 2^7981246409 is an apocalyptic number.

It is an amenable number.

7981246409 is a deficient number, since it is larger than the sum of its proper divisors (29670331).

7981246409 is a wasteful number, since it uses less digits than its factorization.

7981246409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29670330.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 7981246409 is about 89337.8218281597. The cubic root of 7981246409 is about 1998.4359779864.

The spelling of 7981246409 in words is "seven billion, nine hundred eighty-one million, two hundred forty-six thousand, four hundred nine".