191424135493 has 4 divisors (see below), whose sum is σ = 191462478988. Its totient is φ = 191385792000.

The previous prime is 191424135467. The next prime is 191424135521. The reversal of 191424135493 is 394531424191.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102523557249 + 88900578244 = 320193^2 + 298162^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191424135493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191424135593) 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, 19164258 + ... + 19174243.

It is an arithmetic number, because the mean of its divisors is an integer number (47865619747).

Almost surely, 2^191424135493 is an apocalyptic number.

It is an amenable number.

191424135493 is a deficient number, since it is larger than the sum of its proper divisors (38343495).

191424135493 is an equidigital number, since it uses as much as digits as its factorization.

191424135493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38343494.

The product of its digits is 466560, while the sum is 46.

The spelling of 191424135493 in words is "one hundred ninety-one billion, four hundred twenty-four million, one hundred thirty-five thousand, four hundred ninety-three".