551907 has 8 divisors (see below), whose sum is σ = 817680. Its totient is φ = 367920.

The previous prime is 551861. The next prime is 551909. The reversal of 551907 is 709155.

It is not a de Polignac number, because 551907 - 2⁶ = 551843 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 20441 = 551907 / (5 + 5 + 1 + 9 + 0 + 7).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 551907.

It is not an unprimeable number, because it can be changed into a prime (551909) 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 7 ways as a sum of consecutive naturals, for example, 10194 + ... + 10247.

It is an arithmetic number, because the mean of its divisors is an integer number (102210).

2⁵⁵¹⁹⁰⁷ is an apocalyptic number.

551907 is a deficient number, since it is larger than the sum of its proper divisors (265773).

551907 is a wasteful number, since it uses less digits than its factorization.

551907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20450 (or 20444 counting only the distinct ones).

The product of its (nonzero) digits is 1575, while the sum is 27.

The square root of 551907 is about 742.9044353078. The cubic root of 551907 is about 82.0267115040.

The spelling of 551907 in words is "five hundred fifty-one thousand, nine hundred seven".