2478245821 has 2 divisors, whose sum is σ = 2478245822. Its totient is φ = 2478245820.

The previous prime is 2478245797. The next prime is 2478245849. The reversal of 2478245821 is 1285428742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1411504900 + 1066740921 = 37570^2 + 32661^2 .

It is a cyclic number.

It is not a de Polignac number, because 2478245821 - 2¹¹ = 2478243773 is a prime.

It is a super-2 number, since 2×2478245821² = 12283404698607928082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2478248821) 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, 1239122910 + 1239122911.

It is an arithmetic number, because the mean of its divisors is an integer number (1239122911).

Almost surely, 2^2478245821 is an apocalyptic number.

It is an amenable number.

2478245821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2478245821 is an equidigital number, since it uses as much as digits as its factorization.

2478245821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 286720, while the sum is 43.

The square root of 2478245821 is about 49781.9828954211. The cubic root of 2478245821 is about 1353.2606724816.

The spelling of 2478245821 in words is "two billion, four hundred seventy-eight million, two hundred forty-five thousand, eight hundred twenty-one".