551638857 has 32 divisors (see below), whose sum is σ = 923756544. Its totient is φ = 284457600.

The previous prime is 551638847. The next prime is 551638861. The reversal of 551638857 is 758836155.

It is not a de Polignac number, because 551638857 - 2¹² = 551634761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551638817) 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 31 ways as a sum of consecutive naturals, for example, 22932 + ... + 40362.

It is an arithmetic number, because the mean of its divisors is an integer number (28867392).

Almost surely, 2^551638857 is an apocalyptic number.

It is an amenable number.

551638857 is a deficient number, since it is larger than the sum of its proper divisors (372117687).

551638857 is a wasteful number, since it uses less digits than its factorization.

551638857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17589.

The product of its digits is 1008000, while the sum is 48.

The square root of 551638857 is about 23486.9933580269. The cubic root of 551638857 is about 820.1342517647.

The spelling of 551638857 in words is "five hundred fifty-one million, six hundred thirty-eight thousand, eight hundred fifty-seven".