312100109 has 2 divisors, whose sum is σ = 312100110. Its totient is φ = 312100108.

The previous prime is 312100097. The next prime is 312100123. The reversal of 312100109 is 901001213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 239475625 + 72624484 = 15475^2 + 8522^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312100109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312105109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156050054 + 156050055.

It is an arithmetic number, because the mean of its divisors is an integer number (156050055).

Almost surely, 2^312100109 is an apocalyptic number.

It is an amenable number.

312100109 is a deficient number, since it is larger than the sum of its proper divisors (1).

312100109 is an equidigital number, since it uses as much as digits as its factorization.

312100109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 312100109 is about 17666.3552834194. The cubic root of 312100109 is about 678.3148216120.

The spelling of 312100109 in words is "three hundred twelve million, one hundred thousand, one hundred nine".