647443481 has 2 divisors, whose sum is σ = 647443482. Its totient is φ = 647443480.

The previous prime is 647443439. The next prime is 647443519. The reversal of 647443481 is 184344746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 575040400 + 72403081 = 23980^2 + 8509^2 .

It is a cyclic number.

It is not a de Polignac number, because 647443481 - 2¹⁰ = 647442457 is a prime.

It is a super-2 number, since 2×647443481² = 838366122178794722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (647443421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323721740 + 323721741.

It is an arithmetic number, because the mean of its divisors is an integer number (323721741).

Almost surely, 2^647443481 is an apocalyptic number.

It is an amenable number.

647443481 is a deficient number, since it is larger than the sum of its proper divisors (1).

647443481 is an equidigital number, since it uses as much as digits as its factorization.

647443481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 41.

The square root of 647443481 is about 25444.9107092165. The cubic root of 647443481 is about 865.1019430567.

The spelling of 647443481 in words is "six hundred forty-seven million, four hundred forty-three thousand, four hundred eighty-one".