647247547 has 2 divisors, whose sum is σ = 647247548. Its totient is φ = 647247546.

The previous prime is 647247539. The next prime is 647247563. The reversal of 647247547 is 745742746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647247547 - 2³ = 647247539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 647247497 and 647247506.

It is not a weakly prime, because it can be changed into another prime (647247847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323623773 + 323623774.

It is an arithmetic number, because the mean of its divisors is an integer number (323623774).

Almost surely, 2^647247547 is an apocalyptic number.

647247547 is a deficient number, since it is larger than the sum of its proper divisors (1).

647247547 is an equidigital number, since it uses as much as digits as its factorization.

647247547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1317120, while the sum is 46.

The square root of 647247547 is about 25441.0602569940. The cubic root of 647247547 is about 865.0146664625.

The spelling of 647247547 in words is "six hundred forty-seven million, two hundred forty-seven thousand, five hundred forty-seven".