551399 has 4 divisors (see below), whose sum is σ = 580440. Its totient is φ = 522360.

The previous prime is 551387. The next prime is 551407. The reversal of 551399 is 993155.

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 551399 - 2⁸ = 551143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14492 + ... + 14529.

It is an arithmetic number, because the mean of its divisors is an integer number (145110).

2⁵⁵¹³⁹⁹ is an apocalyptic number.

551399 is a deficient number, since it is larger than the sum of its proper divisors (29041).

551399 is a wasteful number, since it uses less digits than its factorization.

551399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29040.

The product of its digits is 6075, while the sum is 32.

The square root of 551399 is about 742.5624552857. The cubic root of 551399 is about 82.0015367549.

The spelling of 551399 in words is "five hundred fifty-one thousand, three hundred ninety-nine".