555494981 has 4 divisors (see below), whose sum is σ = 555595500. Its totient is φ = 555394464.

The previous prime is 555494957. The next prime is 555494993. The reversal of 555494981 is 189494555.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 328841956 + 226653025 = 18134^2 + 15055^2 .

It is a cyclic number.

It is not a de Polignac number, because 555494981 - 2⁶ = 555494917 is a prime.

It is a super-2 number, since 2×555494981² = 617149347832380722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555494911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41456 + ... + 53193.

It is an arithmetic number, because the mean of its divisors is an integer number (138898875).

Almost surely, 2^555494981 is an apocalyptic number.

It is an amenable number.

555494981 is a deficient number, since it is larger than the sum of its proper divisors (100519).

555494981 is an equidigital number, since it uses as much as digits as its factorization.

555494981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100518.

The product of its digits is 1296000, while the sum is 50.

The square root of 555494981 is about 23568.9410241530. The cubic root of 555494981 is about 822.0408124175.

The spelling of 555494981 in words is "five hundred fifty-five million, four hundred ninety-four thousand, nine hundred eighty-one".