551656 has 16 divisors (see below), whose sum is σ = 1182240. Its totient is φ = 236400.

The previous prime is 551653. The next prime is 551659. The reversal of 551656 is 656155.

It is an interprime number because it is at equal distance from previous prime (551653) and next prime (551659).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (551651) 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, 4870 + ... + 4981.

It is an arithmetic number, because the mean of its divisors is an integer number (73890).

2⁵⁵¹⁶⁵⁶ is an apocalyptic number.

551656 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

551656 is an abundant number, since it is smaller than the sum of its proper divisors (630584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551656 is a wasteful number, since it uses less digits than its factorization.

551656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9864 (or 9860 counting only the distinct ones).

The product of its digits is 4500, while the sum is 28.

The square root of 551656 is about 742.7354845435. The cubic root of 551656 is about 82.0142747308.

It can be divided in two parts, 55 and 1656, that added together give a triangular number (1711 = T₅₈).

The spelling of 551656 in words is "five hundred fifty-one thousand, six hundred fifty-six".