206931057 has 8 divisors (see below), whose sum is σ = 276029376. Its totient is φ = 137893392.

The previous prime is 206931019. The next prime is 206931073. The reversal of 206931057 is 750139602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 206931057 - 2¹⁰ = 206930033 is a prime.

It is a super-2 number, since 2×206931057² = 85640924702274498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (206931077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6493 + ... + 21354.

It is an arithmetic number, because the mean of its divisors is an integer number (34503672).

Almost surely, 2^206931057 is an apocalyptic number.

It is an amenable number.

206931057 is a deficient number, since it is larger than the sum of its proper divisors (69098319).

206931057 is a wasteful number, since it uses less digits than its factorization.

206931057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30327.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 206931057 is about 14385.0984355339. The cubic root of 206931057 is about 591.4824894000.

The spelling of 206931057 in words is "two hundred six million, nine hundred thirty-one thousand, fifty-seven".