31321109 has 2 divisors, whose sum is σ = 31321110. Its totient is φ = 31321108.

The previous prime is 31321057. The next prime is 31321127. The reversal of 31321109 is 90112313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31114084 + 207025 = 5578^2 + 455^2 .

It is an emirp because it is prime and its reverse (90112313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31321109 - 2⁸ = 31320853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31321309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660554 + 15660555.

It is an arithmetic number, because the mean of its divisors is an integer number (15660555).

Almost surely, 2^31321109 is an apocalyptic number.

It is an amenable number.

31321109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321109 is an equidigital number, since it uses as much as digits as its factorization.

31321109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 31321109 is about 5596.5265120430. The cubic root of 31321109 is about 315.2189927584.

The spelling of 31321109 in words is "thirty-one million, three hundred twenty-one thousand, one hundred nine".