551115647 has 2 divisors, whose sum is σ = 551115648. Its totient is φ = 551115646.

The previous prime is 551115533. The next prime is 551115659. The reversal of 551115647 is 746511155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 551115647 - 2¹⁸ = 550853503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551115847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275557823 + 275557824.

It is an arithmetic number, because the mean of its divisors is an integer number (275557824).

Almost surely, 2^551115647 is an apocalyptic number.

551115647 is a deficient number, since it is larger than the sum of its proper divisors (1).

551115647 is an equidigital number, since it uses as much as digits as its factorization.

551115647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21000, while the sum is 35.

The square root of 551115647 is about 23475.8524232881. The cubic root of 551115647 is about 819.8748802750.

The spelling of 551115647 in words is "five hundred fifty-one million, one hundred fifteen thousand, six hundred forty-seven".