205115501 has 2 divisors, whose sum is σ = 205115502. Its totient is φ = 205115500.

The previous prime is 205115423. The next prime is 205115509. The reversal of 205115501 is 105511502.

It is a happy number.

205115501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165739876 + 39375625 = 12874^2 + 6275^2 .

It is a cyclic number.

It is not a de Polignac number, because 205115501 - 2¹⁸ = 204853357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205115509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102557750 + 102557751.

It is an arithmetic number, because the mean of its divisors is an integer number (102557751).

Almost surely, 2^205115501 is an apocalyptic number.

It is an amenable number.

205115501 is a deficient number, since it is larger than the sum of its proper divisors (1).

205115501 is an equidigital number, since it uses as much as digits as its factorization.

205115501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 205115501 is about 14321.8539651820. The cubic root of 205115501 is about 589.7475708425.

The spelling of 205115501 in words is "two hundred five million, one hundred fifteen thousand, five hundred one".