551361 has 16 divisors (see below), whose sum is σ = 820800. Its totient is φ = 327168.

The previous prime is 551347. The next prime is 551363. The reversal of 551361 is 163155.

It is a happy number.

It is not a de Polignac number, because 551361 - 2⁶ = 551297 is a prime.

551361 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 551361.

It is not an unprimeable number, because it can be changed into a prime (551363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 685 + ... + 1253.

It is an arithmetic number, because the mean of its divisors is an integer number (51300).

2⁵⁵¹³⁶¹ is an apocalyptic number.

551361 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

551361 is a deficient number, since it is larger than the sum of its proper divisors (269439).

551361 is a wasteful number, since it uses less digits than its factorization.

551361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608.

The product of its digits is 450, while the sum is 21.

The square root of 551361 is about 742.5368677716. The cubic root of 551361 is about 81.9996529829. Note that the first 3 decimals are identical.

The spelling of 551361 in words is "five hundred fifty-one thousand, three hundred sixty-one".