205987801 has 2 divisors, whose sum is σ = 205987802. Its totient is φ = 205987800.

The previous prime is 205987781. The next prime is 205987811. The reversal of 205987801 is 108789502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191850201 + 14137600 = 13851^2 + 3760^2 .

It is a cyclic number.

It is not a de Polignac number, because 205987801 - 2⁹ = 205987289 is a prime.

It is not a weakly prime, because it can be changed into another prime (205987811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102993900 + 102993901.

It is an arithmetic number, because the mean of its divisors is an integer number (102993901).

Almost surely, 2^205987801 is an apocalyptic number.

It is an amenable number.

205987801 is a deficient number, since it is larger than the sum of its proper divisors (1).

205987801 is an equidigital number, since it uses as much as digits as its factorization.

205987801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 205987801 is about 14352.2751158135. The cubic root of 205987801 is about 590.5824001114.

The spelling of 205987801 in words is "two hundred five million, nine hundred eighty-seven thousand, eight hundred one".