555042321 has 32 divisors (see below), whose sum is σ = 850903040. Its totient is φ = 357210000.

The previous prime is 555042311. The next prime is 555042329. The reversal of 555042321 is 123240555.

It is a happy number.

It is not a de Polignac number, because 555042321 - 2⁵ = 555042289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (555042329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 628146 + ... + 629028.

It is an arithmetic number, because the mean of its divisors is an integer number (26590720).

Almost surely, 2^555042321 is an apocalyptic number.

It is an amenable number.

555042321 is a deficient number, since it is larger than the sum of its proper divisors (295860719).

555042321 is a wasteful number, since it uses less digits than its factorization.

555042321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674 (or 1668 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 555042321 is about 23559.3361748586. The cubic root of 555042321 is about 821.8174643970.

Adding to 555042321 its reverse (123240555), we get a palindrome (678282876).

The spelling of 555042321 in words is "five hundred fifty-five million, forty-two thousand, three hundred twenty-one".