647451331 has 2 divisors, whose sum is σ = 647451332. Its totient is φ = 647451330.

The previous prime is 647451323. The next prime is 647451347. The reversal of 647451331 is 133154746.

647451331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647451331 - 2³ = 647451323 is a prime.

It is a super-2 number, since 2×647451331² = 838386452027343122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (647451031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323725665 + 323725666.

It is an arithmetic number, because the mean of its divisors is an integer number (323725666).

Almost surely, 2^647451331 is an apocalyptic number.

647451331 is a deficient number, since it is larger than the sum of its proper divisors (1).

647451331 is an equidigital number, since it uses as much as digits as its factorization.

647451331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 34.

The square root of 647451331 is about 25445.0649635642. The cubic root of 647451331 is about 865.1054393839.

The spelling of 647451331 in words is "six hundred forty-seven million, four hundred fifty-one thousand, three hundred thirty-one".