551965 has 8 divisors (see below), whose sum is σ = 669528. Its totient is φ = 436800.

The previous prime is 551963. The next prime is 551981. The reversal of 551965 is 569155.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 363609 + 188356 = 603^2 + 434^2 .

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

It is not a de Polignac number, because 551965 - 2¹ = 551963 is a prime.

It is a super-2 number, since 2×551965² = 609330722450, which contains 22 as substring.

It is a Duffinian number.

551965 is a lucky number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42 + ... + 1051.

It is an arithmetic number, because the mean of its divisors is an integer number (83691).

2⁵⁵¹⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

551965 is a deficient number, since it is larger than the sum of its proper divisors (117563).

551965 is a wasteful number, since it uses less digits than its factorization.

551965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199.

The product of its digits is 6750, while the sum is 31.

The square root of 551965 is about 742.9434702587. The cubic root of 551965 is about 82.0295848037.

The spelling of 551965 in words is "five hundred fifty-one thousand, nine hundred sixty-five".