1358998409 has 2 divisors, whose sum is σ = 1358998410. Its totient is φ = 1358998408.

The previous prime is 1358998391. The next prime is 1358998469. The reversal of 1358998409 is 9048998531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1320595600 + 38402809 = 36340^2 + 6197^2 .

It is a cyclic number.

It is not a de Polignac number, because 1358998409 - 2¹⁶ = 1358932873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1358998469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 679499204 + 679499205.

It is an arithmetic number, because the mean of its divisors is an integer number (679499205).

Almost surely, 2^1358998409 is an apocalyptic number.

It is an amenable number.

1358998409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1358998409 is an equidigital number, since it uses as much as digits as its factorization.

1358998409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2799360, while the sum is 56.

The square root of 1358998409 is about 36864.5956033699. The cubic root of 1358998409 is about 1107.6596006404.

The spelling of 1358998409 in words is "one billion, three hundred fifty-eight million, nine hundred ninety-eight thousand, four hundred nine".