551345 has 4 divisors (see below), whose sum is σ = 661620. Its totient is φ = 441072.

The previous prime is 551339. The next prime is 551347. The reversal of 551345 is 543155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 543155 = 5 ⋅108631.

It can be written as a sum of positive squares in 2 ways, for example, as 388129 + 163216 = 623^2 + 404^2 .

It is a cyclic number.

It is not a de Polignac number, because 551345 - 2⁶ = 551281 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 551345.

It is not an unprimeable number, because it can be changed into a prime (551347) 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, 55130 + ... + 55139.

It is an arithmetic number, because the mean of its divisors is an integer number (165405).

2⁵⁵¹³⁴⁵ is an apocalyptic number.

It is an amenable number.

551345 is a deficient number, since it is larger than the sum of its proper divisors (110275).

551345 is a wasteful number, since it uses less digits than its factorization.

551345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110274.

The product of its digits is 1500, while the sum is 23.

The square root of 551345 is about 742.5260938176. The cubic root of 551345 is about 81.9988597898.

Adding to 551345 its sum of digits (23), we get a cube (551368 = 82³).

The spelling of 551345 in words is "five hundred fifty-one thousand, three hundred forty-five".