551191717 has 2 divisors, whose sum is σ = 551191718. Its totient is φ = 551191716.

The previous prime is 551191709. The next prime is 551191723. The reversal of 551191717 is 717191155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 530887681 + 20304036 = 23041^2 + 4506^2 .

It is a cyclic number.

It is not a de Polignac number, because 551191717 - 2³ = 551191709 is a prime.

It is equal to p_28904815 and since 551191717 and 28904815 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551191787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275595858 + 275595859.

It is an arithmetic number, because the mean of its divisors is an integer number (275595859).

Almost surely, 2^551191717 is an apocalyptic number.

It is an amenable number.

551191717 is a deficient number, since it is larger than the sum of its proper divisors (1).

551191717 is an equidigital number, since it uses as much as digits as its factorization.

551191717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11025, while the sum is 37.

The square root of 551191717 is about 23477.4725428441. The cubic root of 551191717 is about 819.9126007385.

The spelling of 551191717 in words is "five hundred fifty-one million, one hundred ninety-one thousand, seven hundred seventeen".