551657857 has 2 divisors, whose sum is σ = 551657858. Its totient is φ = 551657856.

The previous prime is 551657809. The next prime is 551657863. The reversal of 551657857 is 758756155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 382241601 + 169416256 = 19551^2 + 13016^2 .

It is a cyclic number.

It is not a de Polignac number, because 551657857 - 2²⁷ = 417440129 is a prime.

It is equal to p_28927867 and since 551657857 and 28927867 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 551657857.

It is not a weakly prime, because it can be changed into another prime (551657357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275828928 + 275828929.

It is an arithmetic number, because the mean of its divisors is an integer number (275828929).

Almost surely, 2^551657857 is an apocalyptic number.

It is an amenable number.

551657857 is a deficient number, since it is larger than the sum of its proper divisors (1).

551657857 is an equidigital number, since it uses as much as digits as its factorization.

551657857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1470000, while the sum is 49.

The square root of 551657857 is about 23487.3978337320. The cubic root of 551657857 is about 820.1436675698.

The spelling of 551657857 in words is "five hundred fifty-one million, six hundred fifty-seven thousand, eight hundred fifty-seven".