206434523 has 4 divisors (see below), whose sum is σ = 210329568. Its totient is φ = 202539480.

The previous prime is 206434513. The next prime is 206434531. The reversal of 206434523 is 325434602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325434602 = 2 ⋅162717301.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206434523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206434513) 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, 1947443 + ... + 1947548.

It is an arithmetic number, because the mean of its divisors is an integer number (52582392).

Almost surely, 2^206434523 is an apocalyptic number.

206434523 is a deficient number, since it is larger than the sum of its proper divisors (3895045).

206434523 is an equidigital number, since it uses as much as digits as its factorization.

206434523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3895044.

The product of its (nonzero) digits is 17280, while the sum is 29.

The square root of 206434523 is about 14367.8294463708. The cubic root of 206434523 is about 591.0090202976.

The spelling of 206434523 in words is "two hundred six million, four hundred thirty-four thousand, five hundred twenty-three".