538450981 has 2 divisors, whose sum is σ = 538450982. Its totient is φ = 538450980.

The previous prime is 538450961. The next prime is 538451027. The reversal of 538450981 is 189054835.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 520524225 + 17926756 = 22815^2 + 4234^2 .

It is a cyclic number.

It is not a de Polignac number, because 538450981 - 2⁵ = 538450949 is a prime.

It is a super-2 number, since 2×538450981² = 579858917879724722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (538450901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269225490 + 269225491.

It is an arithmetic number, because the mean of its divisors is an integer number (269225491).

Almost surely, 2^538450981 is an apocalyptic number.

It is an amenable number.

538450981 is a deficient number, since it is larger than the sum of its proper divisors (1).

538450981 is an equidigital number, since it uses as much as digits as its factorization.

538450981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 43.

The square root of 538450981 is about 23204.5465588104. The cubic root of 538450981 is about 813.5458939903.

It can be divided in two parts, 5384 and 50981, that added together give a palindrome (56365).

The spelling of 538450981 in words is "five hundred thirty-eight million, four hundred fifty thousand, nine hundred eighty-one".