551109217 has 4 divisors (see below), whose sum is σ = 552697776. Its totient is φ = 549520660.

The previous prime is 551109173. The next prime is 551109239. The reversal of 551109217 is 712901155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551109217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551109257) 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, 793759 + ... + 794452.

It is an arithmetic number, because the mean of its divisors is an integer number (138174444).

Almost surely, 2^551109217 is an apocalyptic number.

It is an amenable number.

551109217 is a deficient number, since it is larger than the sum of its proper divisors (1588559).

551109217 is a wasteful number, since it uses less digits than its factorization.

551109217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588558.

The product of its (nonzero) digits is 3150, while the sum is 31.

The square root of 551109217 is about 23475.7154736549. The cubic root of 551109217 is about 819.8716917029.

The spelling of 551109217 in words is "five hundred fifty-one million, one hundred nine thousand, two hundred seventeen".