554991 has 4 divisors (see below), whose sum is σ = 739992. Its totient is φ = 369992.

The previous prime is 554977. The next prime is 555029. The reversal of 554991 is 199455.

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

It is a cyclic number.

It is not a de Polignac number, because 554991 - 2⁵ = 554959 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (554951) 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, 92496 + ... + 92501.

It is an arithmetic number, because the mean of its divisors is an integer number (184998).

2⁵⁵⁴⁹⁹¹ is an apocalyptic number.

554991 is a deficient number, since it is larger than the sum of its proper divisors (185001).

554991 is a wasteful number, since it uses less digits than its factorization.

554991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185000.

The product of its digits is 8100, while the sum is 33.

The square root of 554991 is about 744.9771808586. The cubic root of 554991 is about 82.1792134320.

The spelling of 554991 in words is "five hundred fifty-four thousand, nine hundred ninety-one".