647467841 has 2 divisors, whose sum is σ = 647467842. Its totient is φ = 647467840.

The previous prime is 647467837. The next prime is 647467867. The reversal of 647467841 is 148764746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 544242241 + 103225600 = 23329^2 + 10160^2 .

It is a cyclic number.

It is not a de Polignac number, because 647467841 - 2² = 647467837 is a prime.

It is not a weakly prime, because it can be changed into another prime (647467241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323733920 + 323733921.

It is an arithmetic number, because the mean of its divisors is an integer number (323733921).

Almost surely, 2^647467841 is an apocalyptic number.

It is an amenable number.

647467841 is a deficient number, since it is larger than the sum of its proper divisors (1).

647467841 is an equidigital number, since it uses as much as digits as its factorization.

647467841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 47.

The square root of 647467841 is about 25445.3893858986. The cubic root of 647467841 is about 865.1127927136.

The spelling of 647467841 in words is "six hundred forty-seven million, four hundred sixty-seven thousand, eight hundred forty-one".