1297885789 has 2 divisors, whose sum is σ = 1297885790. Its totient is φ = 1297885788.

The previous prime is 1297885759. The next prime is 1297885793. The reversal of 1297885789 is 9875887921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1156680100 + 141205689 = 34010^2 + 11883^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1297885789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1297885789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1297885739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648942894 + 648942895.

It is an arithmetic number, because the mean of its divisors is an integer number (648942895).

Almost surely, 2^1297885789 is an apocalyptic number.

It is an amenable number.

1297885789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297885789 is an equidigital number, since it uses as much as digits as its factorization.

1297885789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20321280, while the sum is 64.

The square root of 1297885789 is about 36026.1819931005. The cubic root of 1297885789 is about 1090.8009120757.

The spelling of 1297885789 in words is "one billion, two hundred ninety-seven million, eight hundred eighty-five thousand, seven hundred eighty-nine".