1321694089 has 2 divisors, whose sum is σ = 1321694090. Its totient is φ = 1321694088.

The previous prime is 1321694069. The next prime is 1321694113. The reversal of 1321694089 is 9804961231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 960504064 + 361190025 = 30992^2 + 19005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321694089 - 2¹⁵ = 1321661321 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321694009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660847044 + 660847045.

It is an arithmetic number, because the mean of its divisors is an integer number (660847045).

Almost surely, 2^1321694089 is an apocalyptic number.

It is an amenable number.

1321694089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321694089 is an equidigital number, since it uses as much as digits as its factorization.

1321694089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 1321694089 is about 36355.1109061711. The cubic root of 1321694089 is about 1097.4303901969.

The spelling of 1321694089 in words is "one billion, three hundred twenty-one million, six hundred ninety-four thousand, eighty-nine".