20100312109 has 2 divisors, whose sum is σ = 20100312110. Its totient is φ = 20100312108.

The previous prime is 20100312103. The next prime is 20100312131. The reversal of 20100312109 is 90121300102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18520488100 + 1579824009 = 136090^2 + 39747^2 .

It is a cyclic number.

It is not a de Polignac number, because 20100312109 - 2²¹ = 20098214957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20100312103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050156054 + 10050156055.

It is an arithmetic number, because the mean of its divisors is an integer number (10050156055).

Almost surely, 2^20100312109 is an apocalyptic number.

It is an amenable number.

20100312109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20100312109 is an equidigital number, since it uses as much as digits as its factorization.

20100312109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

The spelling of 20100312109 in words is "twenty billion, one hundred million, three hundred twelve thousand, one hundred nine".