1605194345 has 4 divisors (see below), whose sum is σ = 1926233220. Its totient is φ = 1284155472.

The previous prime is 1605194329. The next prime is 1605194359. The reversal of 1605194345 is 5434915061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5434915061 = 523 ⋅10391807.

It can be written as a sum of positive squares in 2 ways, for example, as 776848384 + 828345961 = 27872^2 + 28781^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605194345 - 2⁴ = 1605194329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1605194299 and 1605194308.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160519430 + ... + 160519439.

It is an arithmetic number, because the mean of its divisors is an integer number (481558305).

Almost surely, 2^1605194345 is an apocalyptic number.

It is an amenable number.

1605194345 is a deficient number, since it is larger than the sum of its proper divisors (321038875).

1605194345 is an equidigital number, since it uses as much as digits as its factorization.

1605194345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321038874.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 1605194345 is about 40064.8767001722. The cubic root of 1605194345 is about 1170.8714244801.

The spelling of 1605194345 in words is "one billion, six hundred five million, one hundred ninety-four thousand, three hundred forty-five".