1290880321 has 2 divisors, whose sum is σ = 1290880322. Its totient is φ = 1290880320.

The previous prime is 1290880301. The next prime is 1290880337. The reversal of 1290880321 is 1230880921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1177244721 + 113635600 = 34311^2 + 10660^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290880321 - 2¹⁹ = 1290356033 is a prime.

It is not a weakly prime, because it can be changed into another prime (1290880301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645440160 + 645440161.

It is an arithmetic number, because the mean of its divisors is an integer number (645440161).

Almost surely, 2^1290880321 is an apocalyptic number.

It is an amenable number.

1290880321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290880321 is an equidigital number, since it uses as much as digits as its factorization.

1290880321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 1290880321 is about 35928.8229837828. The cubic root of 1290880321 is about 1088.8348014880.

The spelling of 1290880321 in words is "one billion, two hundred ninety million, eight hundred eighty thousand, three hundred twenty-one".