7543993393 has 2 divisors, whose sum is σ = 7543993394. Its totient is φ = 7543993392.

The previous prime is 7543993367. The next prime is 7543993397. The reversal of 7543993393 is 3933993457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5797756449 + 1746236944 = 76143^2 + 41788^2 .

It is an emirp because it is prime and its reverse (3933993457) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7543993393 is a prime.

It is not a weakly prime, because it can be changed into another prime (7543993397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3771996696 + 3771996697.

It is an arithmetic number, because the mean of its divisors is an integer number (3771996697).

Almost surely, 2^7543993393 is an apocalyptic number.

It is an amenable number.

7543993393 is a deficient number, since it is larger than the sum of its proper divisors (1).

7543993393 is an equidigital number, since it uses as much as digits as its factorization.

7543993393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8266860, while the sum is 55.

The square root of 7543993393 is about 86856.1649682969. The cubic root of 7543993393 is about 1961.2536573033.

The spelling of 7543993393 in words is "seven billion, five hundred forty-three million, nine hundred ninety-three thousand, three hundred ninety-three".