31379285909 has 2 divisors, whose sum is σ = 31379285910. Its totient is φ = 31379285908.

The previous prime is 31379285893. The next prime is 31379285911. The reversal of 31379285909 is 90958297313.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30214087684 + 1165198225 = 173822^2 + 34135^2 .

It is a cyclic number.

It is not a de Polignac number, because 31379285909 - 2⁴ = 31379285893 is a prime.

Together with 31379285911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31379285989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15689642954 + 15689642955.

It is an arithmetic number, because the mean of its divisors is an integer number (15689642955).

Almost surely, 2^31379285909 is an apocalyptic number.

It is an amenable number.

31379285909 is a deficient number, since it is larger than the sum of its proper divisors (1).

31379285909 is an equidigital number, since it uses as much as digits as its factorization.

31379285909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3674160, while the sum is 56.

The spelling of 31379285909 in words is "thirty-one billion, three hundred seventy-nine million, two hundred eighty-five thousand, nine hundred nine".