1653638369 has 2 divisors, whose sum is σ = 1653638370. Its totient is φ = 1653638368.

The previous prime is 1653638347. The next prime is 1653638387. The reversal of 1653638369 is 9638363561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1053976225 + 599662144 = 32465^2 + 24488^2 .

It is an emirp because it is prime and its reverse (9638363561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1653638369 - 2²⁸ = 1385202913 is a prime.

It is a super-2 number, since 2×1653638369² = 5469039710857960322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1653632369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 826819184 + 826819185.

It is an arithmetic number, because the mean of its divisors is an integer number (826819185).

Almost surely, 2^1653638369 is an apocalyptic number.

It is an amenable number.

1653638369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1653638369 is an equidigital number, since it uses as much as digits as its factorization.

1653638369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2099520, while the sum is 50.

The square root of 1653638369 is about 40664.9525881932. The cubic root of 1653638369 is about 1182.5336655756.

The spelling of 1653638369 in words is "one billion, six hundred fifty-three million, six hundred thirty-eight thousand, three hundred sixty-nine".