1355020409 has 2 divisors, whose sum is σ = 1355020410. Its totient is φ = 1355020408.

The previous prime is 1355020393. The next prime is 1355020417. The reversal of 1355020409 is 9040205531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1169298025 + 185722384 = 34195^2 + 13628^2 .

It is a cyclic number.

It is not a de Polignac number, because 1355020409 - 2⁴ = 1355020393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1355020109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 677510204 + 677510205.

It is an arithmetic number, because the mean of its divisors is an integer number (677510205).

Almost surely, 2^1355020409 is an apocalyptic number.

It is an amenable number.

1355020409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1355020409 is an equidigital number, since it uses as much as digits as its factorization.

1355020409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 1355020409 is about 36810.6018559871. The cubic root of 1355020409 is about 1106.5777803462.

The spelling of 1355020409 in words is "one billion, three hundred fifty-five million, twenty thousand, four hundred nine".