1290434813 has 2 divisors, whose sum is σ = 1290434814. Its totient is φ = 1290434812.

The previous prime is 1290434767. The next prime is 1290434819. The reversal of 1290434813 is 3184340921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 935564569 + 354870244 = 30587^2 + 18838^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290434813 - 2⁶ = 1290434749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1290434819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645217406 + 645217407.

It is an arithmetic number, because the mean of its divisors is an integer number (645217407).

Almost surely, 2^1290434813 is an apocalyptic number.

It is an amenable number.

1290434813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290434813 is an equidigital number, since it uses as much as digits as its factorization.

1290434813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 1290434813 is about 35922.6225796503. The cubic root of 1290434813 is about 1088.7095276931.

The spelling of 1290434813 in words is "one billion, two hundred ninety million, four hundred thirty-four thousand, eight hundred thirteen".