813740523 has 4 divisors (see below), whose sum is σ = 1084987368. Its totient is φ = 542493680.

The previous prime is 813740509. The next prime is 813740533. The reversal of 813740523 is 325047318.

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

It is a cyclic number.

It is not a de Polignac number, because 813740523 - 2⁵ = 813740491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (813740503) 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, 135623418 + ... + 135623423.

It is an arithmetic number, because the mean of its divisors is an integer number (271246842).

Almost surely, 2^813740523 is an apocalyptic number.

813740523 is a deficient number, since it is larger than the sum of its proper divisors (271246845).

813740523 is a wasteful number, since it uses less digits than its factorization.

813740523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271246844.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 813740523 is about 28526.1375408589. The cubic root of 813740523 is about 933.6024467881.

The spelling of 813740523 in words is "eight hundred thirteen million, seven hundred forty thousand, five hundred twenty-three".