533987981 has 2 divisors, whose sum is σ = 533987982. Its totient is φ = 533987980.

The previous prime is 533987963. The next prime is 533987999. The reversal of 533987981 is 189789335.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (533987963) and next prime (533987999).

It can be written as a sum of positive squares in only one way, i.e., 301577956 + 232410025 = 17366^2 + 15245^2 .

It is a cyclic number.

It is not a de Polignac number, because 533987981 - 2¹⁴ = 533971597 is a prime.

It is a super-2 number, since 2×533987981² = 570286327704912722, 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 (533987921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 266993990 + 266993991.

It is an arithmetic number, because the mean of its divisors is an integer number (266993991).

Almost surely, 2^533987981 is an apocalyptic number.

It is an amenable number.

533987981 is a deficient number, since it is larger than the sum of its proper divisors (1).

533987981 is an equidigital number, since it uses as much as digits as its factorization.

533987981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 53.

The square root of 533987981 is about 23108.1799586207. The cubic root of 533987981 is about 811.2919386867.

The spelling of 533987981 in words is "five hundred thirty-three million, nine hundred eighty-seven thousand, nine hundred eighty-one".