7978981253 has 2 divisors, whose sum is σ = 7978981254. Its totient is φ = 7978981252.

The previous prime is 7978981223. The next prime is 7978981303. The reversal of 7978981253 is 3521898797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5585619169 + 2393362084 = 74737^2 + 48922^2 .

It is a cyclic number.

It is not a de Polignac number, because 7978981253 - 2¹² = 7978977157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7978981192 and 7978981201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7978981223) 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, 3989490626 + 3989490627.

It is an arithmetic number, because the mean of its divisors is an integer number (3989490627).

Almost surely, 2^7978981253 is an apocalyptic number.

It is an amenable number.

7978981253 is a deficient number, since it is larger than the sum of its proper divisors (1).

7978981253 is an equidigital number, since it uses as much as digits as its factorization.

7978981253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 59.

The square root of 7978981253 is about 89325.1434535652. The cubic root of 7978981253 is about 1998.2469015219.

The spelling of 7978981253 in words is "seven billion, nine hundred seventy-eight million, nine hundred eighty-one thousand, two hundred fifty-three".