558451981 has 2 divisors, whose sum is σ = 558451982. Its totient is φ = 558451980.

The previous prime is 558451963. The next prime is 558452033. The reversal of 558451981 is 189154855.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 475022025 + 83429956 = 21795^2 + 9134^2 .

It is a cyclic number.

It is not a de Polignac number, because 558451981 - 2⁹ = 558451469 is a prime.

It is a super-2 number, since 2×558451981² = 623737230165648722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (558451381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 279225990 + 279225991.

It is an arithmetic number, because the mean of its divisors is an integer number (279225991).

Almost surely, 2^558451981 is an apocalyptic number.

It is an amenable number.

558451981 is a deficient number, since it is larger than the sum of its proper divisors (1).

558451981 is an equidigital number, since it uses as much as digits as its factorization.

558451981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288000, while the sum is 46.

The square root of 558451981 is about 23631.5886262435. The cubic root of 558451981 is about 823.4968557211.

The spelling of 558451981 in words is "five hundred fifty-eight million, four hundred fifty-one thousand, nine hundred eighty-one".