522017981 has 2 divisors, whose sum is σ = 522017982. Its totient is φ = 522017980.

The previous prime is 522017953. The next prime is 522017983. The reversal of 522017981 is 189710225.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 332515225 + 189502756 = 18235^2 + 13766^2 .

It is a cyclic number.

It is not a de Polignac number, because 522017981 - 2¹⁸ = 521755837 is a prime.

It is a super-2 number, since 2×522017981² = 545005544974632722, which contains 22 as substring.

Together with 522017983, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_27453068 and since 522017981 and 27453068 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (522017983) 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, 261008990 + 261008991.

It is an arithmetic number, because the mean of its divisors is an integer number (261008991).

Almost surely, 2^522017981 is an apocalyptic number.

It is an amenable number.

522017981 is a deficient number, since it is larger than the sum of its proper divisors (1).

522017981 is an equidigital number, since it uses as much as digits as its factorization.

522017981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 522017981 is about 22847.7128176980. The cubic root of 522017981 is about 805.1840331274.

The spelling of 522017981 in words is "five hundred twenty-two million, seventeen thousand, nine hundred eighty-one".