205116251 has 2 divisors, whose sum is σ = 205116252. Its totient is φ = 205116250.

The previous prime is 205116209. The next prime is 205116269. The reversal of 205116251 is 152611502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205116251 is a prime.

It is not a weakly prime, because it can be changed into another prime (205116281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102558125 + 102558126.

It is an arithmetic number, because the mean of its divisors is an integer number (102558126).

Almost surely, 2^205116251 is an apocalyptic number.

205116251 is a deficient number, since it is larger than the sum of its proper divisors (1).

205116251 is an equidigital number, since it uses as much as digits as its factorization.

205116251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 205116251 is about 14321.8801489190. The cubic root of 205116251 is about 589.7482896410.

Adding to 205116251 its reverse (152611502), we get a palindrome (357727753).

It can be divided in two parts, 20511 and 6251, that added together give a palindrome (26762).

The spelling of 205116251 in words is "two hundred five million, one hundred sixteen thousand, two hundred fifty-one".