102115205 has 4 divisors (see below), whose sum is σ = 122538252. Its totient is φ = 81692160.

The previous prime is 102115199. The next prime is 102115207. The reversal of 102115205 is 502511201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67092481 + 35022724 = 8191^2 + 5918^2 .

It is not a de Polignac number, because 102115205 - 2²⁰ = 101066629 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 (102115207) 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, 10211516 + ... + 10211525.

It is an arithmetic number, because the mean of its divisors is an integer number (30634563).

Almost surely, 2^102115205 is an apocalyptic number.

It is an amenable number.

102115205 is a deficient number, since it is larger than the sum of its proper divisors (20423047).

102115205 is an equidigital number, since it uses as much as digits as its factorization.

102115205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20423046.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 102115205 is about 10105.2068261862. The cubic root of 102115205 is about 467.4087137193.

Adding to 102115205 its reverse (502511201), we get a palindrome (604626406).

The spelling of 102115205 in words is "one hundred two million, one hundred fifteen thousand, two hundred five".