1653641243 has 2 divisors, whose sum is σ = 1653641244. Its totient is φ = 1653641242.

The previous prime is 1653641173. The next prime is 1653641251. The reversal of 1653641243 is 3421463561.

It is a strong prime.

It is an emirp because it is prime and its reverse (3421463561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1653641243 - 2¹⁸ = 1653379099 is a prime.

It is not a weakly prime, because it can be changed into another prime (1653646243) 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, 826820621 + 826820622.

It is an arithmetic number, because the mean of its divisors is an integer number (826820622).

Almost surely, 2^1653641243 is an apocalyptic number.

1653641243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1653641243 is an equidigital number, since it uses as much as digits as its factorization.

1653641243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 35.

The square root of 1653641243 is about 40664.9879257329. The cubic root of 1653641243 is about 1182.5343506508.

The spelling of 1653641243 in words is "one billion, six hundred fifty-three million, six hundred forty-one thousand, two hundred forty-three".