551409727 has 4 divisors (see below), whose sum is σ = 601537896. Its totient is φ = 501281560.

The previous prime is 551409713. The next prime is 551409791. The reversal of 551409727 is 727904155.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551409727 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 551409727.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551404727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25064068 + ... + 25064089.

It is an arithmetic number, because the mean of its divisors is an integer number (150384474).

Almost surely, 2^551409727 is an apocalyptic number.

551409727 is a deficient number, since it is larger than the sum of its proper divisors (50128169).

551409727 is a wasteful number, since it uses less digits than its factorization.

551409727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50128168.

The product of its (nonzero) digits is 88200, while the sum is 40.

The square root of 551409727 is about 23482.1150452850. The cubic root of 551409727 is about 820.0206850820.

The spelling of 551409727 in words is "five hundred fifty-one million, four hundred nine thousand, seven hundred twenty-seven".