798457981 has 2 divisors, whose sum is σ = 798457982. Its totient is φ = 798457980.

The previous prime is 798457963. The next prime is 798457987. The reversal of 798457981 is 189754897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 752679225 + 45778756 = 27435^2 + 6766^2 .

It is a cyclic number.

It is not a de Polignac number, because 798457981 - 2⁹ = 798457469 is a prime.

It is a super-2 number, since 2×798457981² = 1275070294845192722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (798457987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 399228990 + 399228991.

It is an arithmetic number, because the mean of its divisors is an integer number (399228991).

Almost surely, 2^798457981 is an apocalyptic number.

It is an amenable number.

798457981 is a deficient number, since it is larger than the sum of its proper divisors (1).

798457981 is an equidigital number, since it uses as much as digits as its factorization.

798457981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 58.

The square root of 798457981 is about 28256.9987967583. The cubic root of 798457981 is about 927.7209315725.

The spelling of 798457981 in words is "seven hundred ninety-eight million, four hundred fifty-seven thousand, nine hundred eighty-one".