1356982409 has 2 divisors, whose sum is σ = 1356982410. Its totient is φ = 1356982408.

The previous prime is 1356982399. The next prime is 1356982441. The reversal of 1356982409 is 9042896531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 924342409 + 432640000 = 30403^2 + 20800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1356982409 - 2⁸ = 1356982153 is a prime.

It is not a weakly prime, because it can be changed into another prime (1356982469) 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, 678491204 + 678491205.

It is an arithmetic number, because the mean of its divisors is an integer number (678491205).

Almost surely, 2^1356982409 is an apocalyptic number.

It is an amenable number.

1356982409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1356982409 is an equidigital number, since it uses as much as digits as its factorization.

1356982409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 1356982409 is about 36837.2421470446. The cubic root of 1356982409 is about 1107.1116120508. Note that the first 3 decimals are identical.

The spelling of 1356982409 in words is "one billion, three hundred fifty-six million, nine hundred eighty-two thousand, four hundred nine".