10205861 has 2 divisors, whose sum is σ = 10205862. Its totient is φ = 10205860.

The previous prime is 10205857. The next prime is 10205873. The reversal of 10205861 is 16850201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10201636 + 4225 = 3194^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 10205861 - 2² = 10205857 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10205161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5102930 + 5102931.

It is an arithmetic number, because the mean of its divisors is an integer number (5102931).

Almost surely, 2^10205861 is an apocalyptic number.

It is an amenable number.

10205861 is a deficient number, since it is larger than the sum of its proper divisors (1).

10205861 is an equidigital number, since it uses as much as digits as its factorization.

10205861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 10205861 is about 3194.6613279032. The cubic root of 10205861 is about 216.9118190277.

The spelling of 10205861 in words is "ten million, two hundred five thousand, eight hundred sixty-one".