551626 has 4 divisors (see below), whose sum is σ = 827442. Its totient is φ = 275812.

The previous prime is 551597. The next prime is 551651. The reversal of 551626 is 626155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 626155 = 5 ⋅125231.

It can be written as a sum of positive squares in only one way, i.e., 511225 + 40401 = 715^2 + 201^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 551626.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137905 + ... + 137908.

2⁵⁵¹⁶²⁶ is an apocalyptic number.

551626 is a deficient number, since it is larger than the sum of its proper divisors (275816).

551626 is a wasteful number, since it uses less digits than its factorization.

551626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275815.

The product of its digits is 1800, while the sum is 25.

The square root of 551626 is about 742.7152886537. The cubic root of 551626 is about 82.0127880115.

Subtracting 551626 from its reverse (626155), we obtain a square (74529 = 273²).

It can be divided in two parts, 55 and 1626, that added together give a square (1681 = 41²).

The spelling of 551626 in words is "five hundred fifty-one thousand, six hundred twenty-six".