206291057 has 8 divisors (see below), whose sum is σ = 239280576. Its totient is φ = 174181392.

The previous prime is 206291027. The next prime is 206291069. The reversal of 206291057 is 750192602.

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

It is not a de Polignac number, because 206291057 - 2¹⁰ = 206290033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206291027) 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, 219458 + ... + 220395.

It is an arithmetic number, because the mean of its divisors is an integer number (29910072).

Almost surely, 2^206291057 is an apocalyptic number.

It is an amenable number.

206291057 is a deficient number, since it is larger than the sum of its proper divisors (32989519).

206291057 is an equidigital number, since it uses as much as digits as its factorization.

206291057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439927.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 206291057 is about 14362.8359664796. The cubic root of 206291057 is about 590.8720771989.

The spelling of 206291057 in words is "two hundred six million, two hundred ninety-one thousand, fifty-seven".