551645 has 8 divisors (see below), whose sum is σ = 683520. Its totient is φ = 426960.

The previous prime is 551597. The next prime is 551651. The reversal of 551645 is 546155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 551645 - 2⁶ = 551581 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1625 + ... + 1934.

It is an arithmetic number, because the mean of its divisors is an integer number (85440).

2⁵⁵¹⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

551645 is a deficient number, since it is larger than the sum of its proper divisors (131875).

551645 is a wasteful number, since it uses less digits than its factorization.

551645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3595.

The product of its digits is 3000, while the sum is 26.

The square root of 551645 is about 742.7280794477. The cubic root of 551645 is about 82.0137296067.

The spelling of 551645 in words is "five hundred fifty-one thousand, six hundred forty-five".