551000643 has 8 divisors (see below), whose sum is σ = 742241808. Its totient is φ = 363546624.

The previous prime is 551000629. The next prime is 551000647. The reversal of 551000643 is 346000155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 551000643 - 2²⁵ = 517446211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551000647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 946446 + ... + 947027.

It is an arithmetic number, because the mean of its divisors is an integer number (92780226).

Almost surely, 2^551000643 is an apocalyptic number.

551000643 is a deficient number, since it is larger than the sum of its proper divisors (191241165).

551000643 is a wasteful number, since it uses less digits than its factorization.

551000643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893573.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 551000643 is about 23473.4028849675. The cubic root of 551000643 is about 819.8178472061.

Adding to 551000643 its reverse (346000155), we get a palindrome (897000798).

The spelling of 551000643 in words is "five hundred fifty-one million, six hundred forty-three", and thus it is an aban number.