551625817 has 2 divisors, whose sum is σ = 551625818. Its totient is φ = 551625816.

The previous prime is 551625799. The next prime is 551625829. The reversal of 551625817 is 718526155.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 497691481 + 53934336 = 22309^2 + 7344^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551625817 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 551625817.

It is not a weakly prime, because it can be changed into another prime (551625847) 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 as a sum of consecutive naturals, namely, 275812908 + 275812909.

It is an arithmetic number, because the mean of its divisors is an integer number (275812909).

Almost surely, 2^551625817 is an apocalyptic number.

It is an amenable number.

551625817 is a deficient number, since it is larger than the sum of its proper divisors (1).

551625817 is an equidigital number, since it uses as much as digits as its factorization.

551625817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84000, while the sum is 40.

The square root of 551625817 is about 23486.7157559332. The cubic root of 551625817 is about 820.1277894238.

The spelling of 551625817 in words is "five hundred fifty-one million, six hundred twenty-five thousand, eight hundred seventeen".