205515013 has 4 divisors (see below), whose sum is σ = 224198208. Its totient is φ = 186831820.

The previous prime is 205514999. The next prime is 205515047. The reversal of 205515013 is 310515502.

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-205515013 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 (205515073) 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, 9341581 + ... + 9341602.

It is an arithmetic number, because the mean of its divisors is an integer number (56049552).

Almost surely, 2^205515013 is an apocalyptic number.

It is an amenable number.

205515013 is a deficient number, since it is larger than the sum of its proper divisors (18683195).

205515013 is a wasteful number, since it uses less digits than its factorization.

205515013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18683194.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 205515013 is about 14335.7948157750. The cubic root of 205515013 is about 590.1302144843.

The spelling of 205515013 in words is "two hundred five million, five hundred fifteen thousand, thirteen".