193508993 has 4 divisors (see below), whose sum is σ = 194481600. Its totient is φ = 192536388.

The previous prime is 193508969. The next prime is 193509049. The reversal of 193508993 is 399805391.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 193508993 - 2⁶ = 193508929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (193508923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486005 + ... + 486402.

It is an arithmetic number, because the mean of its divisors is an integer number (48620400).

Almost surely, 2^193508993 is an apocalyptic number.

It is an amenable number.

193508993 is a deficient number, since it is larger than the sum of its proper divisors (972607).

193508993 is an equidigital number, since it uses as much as digits as its factorization.

193508993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972606.

The product of its (nonzero) digits is 262440, while the sum is 47.

The square root of 193508993 is about 13910.7509861977. The cubic root of 193508993 is about 578.4072362674.

The spelling of 193508993 in words is "one hundred ninety-three million, five hundred eight thousand, nine hundred ninety-three".