555339981 has 32 divisors (see below), whose sum is σ = 875449600. Its totient is φ = 312947712.

The previous prime is 555339979. The next prime is 555340021. The reversal of 555339981 is 189933555.

It is a happy number.

It is not a de Polignac number, because 555339981 - 2¹ = 555339979 is a prime.

It is a super-2 number, since 2×555339981² = 616804988994160722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 555339981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555339971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71421 + ... + 78813.

It is an arithmetic number, because the mean of its divisors is an integer number (27357800).

Almost surely, 2^555339981 is an apocalyptic number.

It is an amenable number.

555339981 is a deficient number, since it is larger than the sum of its proper divisors (320109619).

555339981 is an equidigital number, since it uses as much as digits as its factorization.

555339981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7490 (or 7476 counting only the distinct ones).

The product of its digits is 729000, while the sum is 48.

The square root of 555339981 is about 23565.6525689402. The cubic root of 555339981 is about 821.9643471729.

The spelling of 555339981 in words is "five hundred fifty-five million, three hundred thirty-nine thousand, nine hundred eighty-one".