205118013 has 4 divisors (see below), whose sum is σ = 273490688. Its totient is φ = 136745340.

The previous prime is 205117967. The next prime is 205118029. The reversal of 205118013 is 310811502.

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 not a de Polignac number, because 205118013 - 2⁶ = 205117949 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 (205118093) 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, 34186333 + ... + 34186338.

It is an arithmetic number, because the mean of its divisors is an integer number (68372672).

Almost surely, 2^205118013 is an apocalyptic number.

It is an amenable number.

205118013 is a deficient number, since it is larger than the sum of its proper divisors (68372675).

205118013 is an equidigital number, since it uses as much as digits as its factorization.

205118013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68372674.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 205118013 is about 14321.9416630567. The cubic root of 205118013 is about 589.7499783314.

Adding to 205118013 its reverse (310811502), we get a palindrome (515929515).

The spelling of 205118013 in words is "two hundred five million, one hundred eighteen thousand, thirteen".