551139 has 4 divisors (see below), whose sum is σ = 734856. Its totient is φ = 367424.

The previous prime is 551129. The next prime is 551143. The reversal of 551139 is 931155.

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

It is a cyclic number.

It is not a de Polignac number, because 551139 - 2⁵ = 551107 is a prime.

It is an Ulam number.

It is a D-number.

551139 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 551139.

It is not an unprimeable number, because it can be changed into a prime (551129) 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, 91854 + ... + 91859.

It is an arithmetic number, because the mean of its divisors is an integer number (183714).

2⁵⁵¹¹³⁹ is an apocalyptic number.

551139 is a deficient number, since it is larger than the sum of its proper divisors (183717).

551139 is a wasteful number, since it uses less digits than its factorization.

551139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183716.

The product of its digits is 675, while the sum is 24.

The square root of 551139 is about 742.3873651942. The cubic root of 551139 is about 81.9886460584.

The spelling of 551139 in words is "five hundred fifty-one thousand, one hundred thirty-nine".