1296669389 has 2 divisors, whose sum is σ = 1296669390. Its totient is φ = 1296669388.

The previous prime is 1296669349. The next prime is 1296669419. The reversal of 1296669389 is 9839666921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 932813764 + 363855625 = 30542^2 + 19075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1296669389 - 2⁸ = 1296669133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1296669349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648334694 + 648334695.

It is an arithmetic number, because the mean of its divisors is an integer number (648334695).

Almost surely, 2^1296669389 is an apocalyptic number.

It is an amenable number.

1296669389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1296669389 is an equidigital number, since it uses as much as digits as its factorization.

1296669389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7558272, while the sum is 59.

The square root of 1296669389 is about 36009.2958692613. The cubic root of 1296669389 is about 1090.4600333503.

The spelling of 1296669389 in words is "one billion, two hundred ninety-six million, six hundred sixty-nine thousand, three hundred eighty-nine".