551656487 has 2 divisors, whose sum is σ = 551656488. Its totient is φ = 551656486.

The previous prime is 551656463. The next prime is 551656559. The reversal of 551656487 is 784656155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551656487 - 2⁶ = 551656423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551656187) 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 as a sum of consecutive naturals, namely, 275828243 + 275828244.

It is an arithmetic number, because the mean of its divisors is an integer number (275828244).

Almost surely, 2^551656487 is an apocalyptic number.

551656487 is a deficient number, since it is larger than the sum of its proper divisors (1).

551656487 is an equidigital number, since it uses as much as digits as its factorization.

551656487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008000, while the sum is 47.

The square root of 551656487 is about 23487.3686691379. The cubic root of 551656487 is about 820.1429886479.

The spelling of 551656487 in words is "five hundred fifty-one million, six hundred fifty-six thousand, four hundred eighty-seven".