1605513397 has 2 divisors, whose sum is σ = 1605513398. Its totient is φ = 1605513396.

The previous prime is 1605513353. The next prime is 1605513401. The reversal of 1605513397 is 7933155061.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1602721156 + 2792241 = 40034^2 + 1671^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605513397 - 2²⁷ = 1471295669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1605513347) 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 as a sum of consecutive naturals, namely, 802756698 + 802756699.

It is an arithmetic number, because the mean of its divisors is an integer number (802756699).

Almost surely, 2^1605513397 is an apocalyptic number.

It is an amenable number.

1605513397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605513397 is an equidigital number, since it uses as much as digits as its factorization.

1605513397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 85050, while the sum is 40.

The square root of 1605513397 is about 40068.8581943634. The cubic root of 1605513397 is about 1170.9489943442.

The spelling of 1605513397 in words is "one billion, six hundred five million, five hundred thirteen thousand, three hundred ninety-seven".