10205400109 has 2 divisors, whose sum is σ = 10205400110. Its totient is φ = 10205400108.

The previous prime is 10205400103. The next prime is 10205400119. The reversal of 10205400109 is 90100450201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7836144484 + 2369255625 = 88522^2 + 48675^2 .

It is a cyclic number.

It is not a de Polignac number, because 10205400109 - 2⁹ = 10205399597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10205400109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10205400103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5102700054 + 5102700055.

It is an arithmetic number, because the mean of its divisors is an integer number (5102700055).

Almost surely, 2^10205400109 is an apocalyptic number.

It is an amenable number.

10205400109 is a deficient number, since it is larger than the sum of its proper divisors (1).

10205400109 is an equidigital number, since it uses as much as digits as its factorization.

10205400109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

The spelling of 10205400109 in words is "ten billion, two hundred five million, four hundred thousand, one hundred nine".