558641981 has 8 divisors (see below), whose sum is σ = 591716664. Its totient is φ = 525591040.

The previous prime is 558641959. The next prime is 558641989. The reversal of 558641981 is 189146855.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 106399225 + 452242756 = 10315^2 + 21266^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 558641981 - 2¹⁸ = 558379837 is a prime.

It is a super-2 number, since 2×558641981² = 624161725871208722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (558641989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71441 + ... + 78873.

It is an arithmetic number, because the mean of its divisors is an integer number (73964583).

Almost surely, 2^558641981 is an apocalyptic number.

It is an amenable number.

558641981 is a deficient number, since it is larger than the sum of its proper divisors (33074683).

558641981 is a wasteful number, since it uses less digits than its factorization.

558641981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11871.

The product of its digits is 345600, while the sum is 47.

The square root of 558641981 is about 23635.6083272676. The cubic root of 558641981 is about 823.5902368692.

The spelling of 558641981 in words is "five hundred fifty-eight million, six hundred forty-one thousand, nine hundred eighty-one".