205851493 has 4 divisors (see below), whose sum is σ = 210231360. Its totient is φ = 201471628.

The previous prime is 205851479. The next prime is 205851497. The reversal of 205851493 is 394158502.

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-205851493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205851497) 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, 2189863 + ... + 2189956.

It is an arithmetic number, because the mean of its divisors is an integer number (52557840).

Almost surely, 2^205851493 is an apocalyptic number.

It is an amenable number.

205851493 is a deficient number, since it is larger than the sum of its proper divisors (4379867).

205851493 is an equidigital number, since it uses as much as digits as its factorization.

205851493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4379866.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 205851493 is about 14347.5256751818. The cubic root of 205851493 is about 590.4521029635.

The spelling of 205851493 in words is "two hundred five million, eight hundred fifty-one thousand, four hundred ninety-three".