551990 has 24 divisors (see below), whose sum is σ = 1060992. Its totient is φ = 206720.

The previous prime is 551981. The next prime is 552001. The reversal of 551990 is 99155.

It is an Ulam number.

It is a Curzon number.

It is a plaindrome in base 11.

It is a congruent number.

It is an unprimeable number.

551990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2795 + ... + 2985.

It is an arithmetic number, because the mean of its divisors is an integer number (44208).

2⁵⁵¹⁹⁹⁰ is an apocalyptic number.

551990 is a deficient number, since it is larger than the sum of its proper divisors (509002).

551990 is a wasteful number, since it uses less digits than its factorization.

551990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 2025, while the sum is 29.

The square root of 551990 is about 742.9602950360. The cubic root of 551990 is about 82.0308232329.

It can be divided in two parts, 551 and 990, that multiplied together give a triangular number (545490 = T₁₀₄₄).

The spelling of 551990 in words is "five hundred fifty-one thousand, nine hundred ninety".