1290870409 has 2 divisors, whose sum is σ = 1290870410. Its totient is φ = 1290870408.

The previous prime is 1290870407. The next prime is 1290870433. The reversal of 1290870409 is 9040780921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1155660025 + 135210384 = 33995^2 + 11628^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290870409 - 2¹ = 1290870407 is a prime.

Together with 1290870407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1290870407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645435204 + 645435205.

It is an arithmetic number, because the mean of its divisors is an integer number (645435205).

Almost surely, 2^1290870409 is an apocalyptic number.

It is an amenable number.

1290870409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290870409 is an equidigital number, since it uses as much as digits as its factorization.

1290870409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 1290870409 is about 35928.6850441260. The cubic root of 1290870409 is about 1088.8320146151.

The spelling of 1290870409 in words is "one billion, two hundred ninety million, eight hundred seventy thousand, four hundred nine".