206530457 has 4 divisors (see below), whose sum is σ = 236034816. Its totient is φ = 177026100.

The previous prime is 206530451. The next prime is 206530469. The reversal of 206530457 is 754035602.

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 a de Polignac number, because none of the positive numbers 2^k-206530457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206530451) 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, 14752169 + ... + 14752182.

It is an arithmetic number, because the mean of its divisors is an integer number (59008704).

Almost surely, 2^206530457 is an apocalyptic number.

It is an amenable number.

206530457 is a deficient number, since it is larger than the sum of its proper divisors (29504359).

206530457 is an equidigital number, since it uses as much as digits as its factorization.

206530457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29504358.

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 206530457 is about 14371.1675586920. The cubic root of 206530457 is about 591.1005571167.

The spelling of 206530457 in words is "two hundred six million, five hundred thirty thousand, four hundred fifty-seven".