1647276641 has 2 divisors, whose sum is σ = 1647276642. Its totient is φ = 1647276640.

The previous prime is 1647276571. The next prime is 1647276671. The reversal of 1647276641 is 1466727461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1564993600 + 82283041 = 39560^2 + 9071^2 .

It is a cyclic number.

It is not a de Polignac number, because 1647276641 - 2¹⁸ = 1647014497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1647276592 and 1647276601.

It is not a weakly prime, because it can be changed into another prime (1647276671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823638320 + 823638321.

It is an arithmetic number, because the mean of its divisors is an integer number (823638321).

Almost surely, 2^1647276641 is an apocalyptic number.

It is an amenable number.

1647276641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1647276641 is an equidigital number, since it uses as much as digits as its factorization.

1647276641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 44.

The square root of 1647276641 is about 40586.6559474909. The cubic root of 1647276641 is about 1181.0152712361.

The spelling of 1647276641 in words is "one billion, six hundred forty-seven million, two hundred seventy-six thousand, six hundred forty-one".