205857253 has 4 divisors (see below), whose sum is σ = 235265440. Its totient is φ = 176449068.

The previous prime is 205857209. The next prime is 205857263. The reversal of 205857253 is 352758502.

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 not a de Polignac number, because 205857253 - 2⁹ = 205856741 is a prime.

It is a super-2 number, since 2×205857253² = 84754417225412018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205857203) 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, 14704083 + ... + 14704096.

It is an arithmetic number, because the mean of its divisors is an integer number (58816360).

Almost surely, 2^205857253 is an apocalyptic number.

It is an amenable number.

205857253 is a deficient number, since it is larger than the sum of its proper divisors (29408187).

205857253 is an equidigital number, since it uses as much as digits as its factorization.

205857253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29408186.

The product of its (nonzero) digits is 84000, while the sum is 37.

The square root of 205857253 is about 14347.7264052532. The cubic root of 205857253 is about 590.4576101252.

The spelling of 205857253 in words is "two hundred five million, eight hundred fifty-seven thousand, two hundred fifty-three".