551551 has 32 divisors (see below), whose sum is σ = 806400. Its totient is φ = 362880.

The previous prime is 551549. The next prime is 551557. The reversal of 551551 is 155155.

It is not a de Polignac number, because 551551 - 2¹ = 551549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19005 + ... + 19033.

It is an arithmetic number, because the mean of its divisors is an integer number (25200).

2⁵⁵¹⁵⁵¹ is an apocalyptic number.

551551 is a deficient number, since it is larger than the sum of its proper divisors (254849).

551551 is a wasteful number, since it uses less digits than its factorization.

551551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79.

The product of its digits is 625, while the sum is 22.

The square root of 551551 is about 742.6647965267. The cubic root of 551551 is about 82.0090709775.

The spelling of 551551 in words is "five hundred fifty-one thousand, five hundred fifty-one".