551091 has 4 divisors (see below), whose sum is σ = 734792. Its totient is φ = 367392.

The previous prime is 551069. The next prime is 551093. The reversal of 551091 is 190155.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 551091 - 2⁵ = 551059 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551093) 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, 91846 + ... + 91851.

It is an arithmetic number, because the mean of its divisors is an integer number (183698).

2⁵⁵¹⁰⁹¹ is an apocalyptic number.

551091 is a deficient number, since it is larger than the sum of its proper divisors (183701).

551091 is a wasteful number, since it uses less digits than its factorization.

551091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183700.

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 551091 is about 742.3550363539. The cubic root of 551091 is about 81.9862657942.

The spelling of 551091 in words is "five hundred fifty-one thousand, ninety-one".