551387 has 2 divisors, whose sum is σ = 551388. Its totient is φ = 551386.

The previous prime is 551381. The next prime is 551407. The reversal of 551387 is 783155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551387 - 2¹² = 547291 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 5 + 5⁵ + 3¹² + 1 + 8 + 7⁵ .

It is not a weakly prime, because it can be changed into another prime (551381) 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, 275693 + 275694.

It is an arithmetic number, because the mean of its divisors is an integer number (275694).

2⁵⁵¹³⁸⁷ is an apocalyptic number.

551387 is a deficient number, since it is larger than the sum of its proper divisors (1).

551387 is an equidigital number, since it uses as much as digits as its factorization.

551387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4200, while the sum is 29.

The square root of 551387 is about 742.5543751134. The cubic root of 551387 is about 82.0009418888. Note that the first 3 decimals are identical.

The spelling of 551387 in words is "five hundred fifty-one thousand, three hundred eighty-seven".