1297645633 has 2 divisors, whose sum is σ = 1297645634. Its totient is φ = 1297645632.

The previous prime is 1297645631. The next prime is 1297645651. The reversal of 1297645633 is 3365467921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1000014129 + 297631504 = 31623^2 + 17252^2 .

It is a cyclic number.

It is not a de Polignac number, because 1297645633 - 2¹ = 1297645631 is a prime.

Together with 1297645631, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1297645631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648822816 + 648822817.

It is an arithmetic number, because the mean of its divisors is an integer number (648822817).

Almost surely, 2^1297645633 is an apocalyptic number.

It is an amenable number.

1297645633 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297645633 is an equidigital number, since it uses as much as digits as its factorization.

1297645633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 46.

The square root of 1297645633 is about 36022.8487629726. The cubic root of 1297645633 is about 1090.7336286663.

The spelling of 1297645633 in words is "one billion, two hundred ninety-seven million, six hundred forty-five thousand, six hundred thirty-three".