551644 has 6 divisors (see below), whose sum is σ = 965384. Its totient is φ = 275820.

The previous prime is 551597. The next prime is 551651. The reversal of 551644 is 446155.

551644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×551644² = 608622205472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68952 + ... + 68959.

2⁵⁵¹⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

551644 is a deficient number, since it is larger than the sum of its proper divisors (413740).

551644 is a wasteful number, since it uses less digits than its factorization.

551644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137915 (or 137913 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 551644 is about 742.7274062535. The cubic root of 551644 is about 82.0136800496.

Adding to 551644 its reverse (446155), we get a palindrome (997799).

The spelling of 551644 in words is "five hundred fifty-one thousand, six hundred forty-four".