647544479 has 2 divisors, whose sum is σ = 647544480. Its totient is φ = 647544478.

The previous prime is 647544421. The next prime is 647544533. The reversal of 647544479 is 974445746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647544479 - 2⁸ = 647544223 is a prime.

It is a Sophie Germain 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 (647544179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323772239 + 323772240.

It is an arithmetic number, because the mean of its divisors is an integer number (323772240).

Almost surely, 2^647544479 is an apocalyptic number.

647544479 is a deficient number, since it is larger than the sum of its proper divisors (1).

647544479 is an equidigital number, since it uses as much as digits as its factorization.

647544479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 50.

The square root of 647544479 is about 25446.8952723117. The cubic root of 647544479 is about 865.1469246011.

The spelling of 647544479 in words is "six hundred forty-seven million, five hundred forty-four thousand, four hundred seventy-nine".