204100139 has 2 divisors, whose sum is σ = 204100140. Its totient is φ = 204100138.

The previous prime is 204100129. The next prime is 204100159. The reversal of 204100139 is 931001402.

It is an a-pointer prime, because the next prime (204100159) can be obtained adding 204100139 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204100139 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204100139.

It is not a weakly prime, because it can be changed into another prime (204100129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102050069 + 102050070.

It is an arithmetic number, because the mean of its divisors is an integer number (102050070).

Almost surely, 2^204100139 is an apocalyptic number.

204100139 is a deficient number, since it is larger than the sum of its proper divisors (1).

204100139 is an equidigital number, since it uses as much as digits as its factorization.

204100139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 204100139 is about 14286.3619931738. The cubic root of 204100139 is about 588.7728386102.

The spelling of 204100139 in words is "two hundred four million, one hundred thousand, one hundred thirty-nine".