205440051 has 8 divisors (see below), whose sum is σ = 274636800. Its totient is φ = 136601672.

The previous prime is 205440049. The next prime is 205440077. The reversal of 205440051 is 150044502.

205440051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 205440051 - 2¹ = 205440049 is a prime.

It is a super-2 number, since 2×205440051² = 84411229109765202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (205440091) 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, 88251 + ... + 90548.

It is an arithmetic number, because the mean of its divisors is an integer number (34329600).

Almost surely, 2^205440051 is an apocalyptic number.

205440051 is a deficient number, since it is larger than the sum of its proper divisors (69196749).

205440051 is a wasteful number, since it uses less digits than its factorization.

205440051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179185.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 205440051 is about 14333.1800728240. The cubic root of 205440051 is about 590.0584553784.

Adding to 205440051 its reverse (150044502), we get a palindrome (355484553).

The spelling of 205440051 in words is "two hundred five million, four hundred forty thousand, fifty-one".