31942109 has 2 divisors, whose sum is σ = 31942110. Its totient is φ = 31942108.

The previous prime is 31942103. The next prime is 31942117. The reversal of 31942109 is 90124913.

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., 29398084 + 2544025 = 5422^2 + 1595^2 .

It is an emirp because it is prime and its reverse (90124913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31942109 - 2²⁴ = 15164893 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 (31942103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15971054 + 15971055.

It is an arithmetic number, because the mean of its divisors is an integer number (15971055).

Almost surely, 2^31942109 is an apocalyptic number.

It is an amenable number.

31942109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31942109 is an equidigital number, since it uses as much as digits as its factorization.

31942109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 31942109 is about 5651.7350433296. The cubic root of 31942109 is about 317.2886443387.

The spelling of 31942109 in words is "thirty-one million, nine hundred forty-two thousand, one hundred nine".