205140111 has 8 divisors (see below), whose sum is σ = 298385664. Its totient is φ = 124327320.

The previous prime is 205140107. The next prime is 205140119. The reversal of 205140111 is 111041502.

It is a happy number.

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

It is not a de Polignac number, because 205140111 - 2² = 205140107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205140119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3108151 + ... + 3108216.

It is an arithmetic number, because the mean of its divisors is an integer number (37298208).

Almost surely, 2^205140111 is an apocalyptic number.

205140111 is a deficient number, since it is larger than the sum of its proper divisors (93245553).

205140111 is a wasteful number, since it uses less digits than its factorization.

205140111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6216381.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 205140111 is about 14322.7131158869. The cubic root of 205140111 is about 589.7711561026.

Adding to 205140111 its reverse (111041502), we get a palindrome (316181613).

The spelling of 205140111 in words is "two hundred five million, one hundred forty thousand, one hundred eleven".