205689401 has 8 divisors (see below), whose sum is σ = 211460424. Its totient is φ = 199929600.

The previous prime is 205689389. The next prime is 205689439. The reversal of 205689401 is 104986502.

It can be written as a sum of positive squares in 4 ways, for example, as 3367225 + 202322176 = 1835^2 + 14224^2 .

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 205689401 - 2²² = 201495097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205689461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46001 + ... + 50273.

It is an arithmetic number, because the mean of its divisors is an integer number (26432553).

Almost surely, 2^205689401 is an apocalyptic number.

It is an amenable number.

205689401 is a deficient number, since it is larger than the sum of its proper divisors (5771023).

205689401 is a wasteful number, since it uses less digits than its factorization.

205689401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5611.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 205689401 is about 14341.8757838715. The cubic root of 205689401 is about 590.2970839372.

The spelling of 205689401 in words is "two hundred five million, six hundred eighty-nine thousand, four hundred one".