31320109 has 2 divisors, whose sum is σ = 31320110. Its totient is φ = 31320108.

The previous prime is 31320083. The next prime is 31320173. The reversal of 31320109 is 90102313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16281225 + 15038884 = 4035^2 + 3878^2 .

It is a cyclic number.

It is not a de Polignac number, because 31320109 - 2¹⁵ = 31287341 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 (31321109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660054 + 15660055.

It is an arithmetic number, because the mean of its divisors is an integer number (15660055).

Almost surely, 2^31320109 is an apocalyptic number.

It is an amenable number.

31320109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31320109 is an equidigital number, since it uses as much as digits as its factorization.

31320109 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 19.

The square root of 31320109 is about 5596.4371702003. The cubic root of 31320109 is about 315.2156380203.

The spelling of 31320109 in words is "thirty-one million, three hundred twenty thousand, one hundred nine".