1605513353 has 2 divisors, whose sum is σ = 1605513354. Its totient is φ = 1605513352.

The previous prime is 1605513347. The next prime is 1605513397. The reversal of 1605513353 is 3533155061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1055470144 + 550043209 = 32488^2 + 23453^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605513353 - 2²⁴ = 1588736137 is a prime.

It is a super-2 number, since 2×1605513353² = 5155346253322605218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1605513323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802756676 + 802756677.

It is an arithmetic number, because the mean of its divisors is an integer number (802756677).

Almost surely, 2^1605513353 is an apocalyptic number.

It is an amenable number.

1605513353 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605513353 is an equidigital number, since it uses as much as digits as its factorization.

1605513353 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20250, while the sum is 32.

The square root of 1605513353 is about 40068.8576453085. The cubic root of 1605513353 is about 1170.9489836474.

The spelling of 1605513353 in words is "one billion, six hundred five million, five hundred thirteen thousand, three hundred fifty-three".