193145457 has 4 divisors (see below), whose sum is σ = 257527280. Its totient is φ = 128763636.

The previous prime is 193145453. The next prime is 193145471. The reversal of 193145457 is 754541391.

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 not a de Polignac number, because 193145457 - 2² = 193145453 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (193145453) 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 in 3 ways as a sum of consecutive naturals, for example, 32190907 + ... + 32190912.

It is an arithmetic number, because the mean of its divisors is an integer number (64381820).

Almost surely, 2^193145457 is an apocalyptic number.

It is an amenable number.

193145457 is a deficient number, since it is larger than the sum of its proper divisors (64381823).

193145457 is an equidigital number, since it uses as much as digits as its factorization.

193145457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64381822.

The product of its digits is 75600, while the sum is 39.

The square root of 193145457 is about 13897.6781154263. The cubic root of 193145457 is about 578.0448006286.

The spelling of 193145457 in words is "one hundred ninety-three million, one hundred forty-five thousand, four hundred fifty-seven".