547817981 has 2 divisors, whose sum is σ = 547817982. Its totient is φ = 547817980.

The previous prime is 547817969. The next prime is 547817989. The reversal of 547817981 is 189718745.

547817981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 375972100 + 171845881 = 19390^2 + 13109^2 .

It is a cyclic number.

It is not a de Polignac number, because 547817981 - 2¹⁸ = 547555837 is a prime.

It is a super-2 number, since 2×547817981² = 600209080613832722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (547817989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 273908990 + 273908991.

It is an arithmetic number, because the mean of its divisors is an integer number (273908991).

Almost surely, 2^547817981 is an apocalyptic number.

It is an amenable number.

547817981 is a deficient number, since it is larger than the sum of its proper divisors (1).

547817981 is an equidigital number, since it uses as much as digits as its factorization.

547817981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 50.

The square root of 547817981 is about 23405.5117653941. The cubic root of 547817981 is about 818.2363348302.

The spelling of 547817981 in words is "five hundred forty-seven million, eight hundred seventeen thousand, nine hundred eighty-one".