1355791685 has 4 divisors (see below), whose sum is σ = 1626950028. Its totient is φ = 1084633344.

The previous prime is 1355791651. The next prime is 1355791687. The reversal of 1355791685 is 5861975531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5861975531 = 577 ⋅10159403.

It can be written as a sum of positive squares in 2 ways, for example, as 257730916 + 1098060769 = 16054^2 + 33137^2 .

It is a cyclic number.

It is not a de Polignac number, because 1355791685 - 2²² = 1351597381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355791687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135579164 + ... + 135579173.

It is an arithmetic number, because the mean of its divisors is an integer number (406737507).

Almost surely, 2^1355791685 is an apocalyptic number.

It is an amenable number.

1355791685 is a deficient number, since it is larger than the sum of its proper divisors (271158343).

1355791685 is an equidigital number, since it uses as much as digits as its factorization.

1355791685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271158342.

The product of its digits is 1134000, while the sum is 50.

The square root of 1355791685 is about 36821.0766409675. The cubic root of 1355791685 is about 1106.7876947743.

The spelling of 1355791685 in words is "one billion, three hundred fifty-five million, seven hundred ninety-one thousand, six hundred eighty-five".