551205647 has 2 divisors, whose sum is σ = 551205648. Its totient is φ = 551205646.

The previous prime is 551205631. The next prime is 551205653. The reversal of 551205647 is 746502155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 551205647 - 2⁴ = 551205631 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551205607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275602823 + 275602824.

It is an arithmetic number, because the mean of its divisors is an integer number (275602824).

Almost surely, 2^551205647 is an apocalyptic number.

551205647 is a deficient number, since it is larger than the sum of its proper divisors (1).

551205647 is an equidigital number, since it uses as much as digits as its factorization.

551205647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 551205647 is about 23477.7692083383. The cubic root of 551205647 is about 819.9195077643.

The spelling of 551205647 in words is "five hundred fifty-one million, two hundred five thousand, six hundred forty-seven".