551643349 has 4 divisors (see below), whose sum is σ = 553180320. Its totient is φ = 550106380.

The previous prime is 551643343. The next prime is 551643373. The reversal of 551643349 is 943346155.

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 not a de Polignac number, because 551643349 - 2⁷ = 551643221 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551643343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 767947 + ... + 768664.

It is an arithmetic number, because the mean of its divisors is an integer number (138295080).

Almost surely, 2^551643349 is an apocalyptic number.

It is an amenable number.

551643349 is a deficient number, since it is larger than the sum of its proper divisors (1536971).

551643349 is a wasteful number, since it uses less digits than its factorization.

551643349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536970.

The product of its digits is 194400, while the sum is 40.

The square root of 551643349 is about 23487.0889852276. The cubic root of 551643349 is about 820.1364778787.

The spelling of 551643349 in words is "five hundred fifty-one million, six hundred forty-three thousand, three hundred forty-nine".