31109297 has 2 divisors, whose sum is σ = 31109298. Its totient is φ = 31109296.

The previous prime is 31109293. The next prime is 31109321. The reversal of 31109297 is 79290113.

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., 16394401 + 14714896 = 4049^2 + 3836^2 .

It is a cyclic number.

It is not a de Polignac number, because 31109297 - 2² = 31109293 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31109291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15554648 + 15554649.

It is an arithmetic number, because the mean of its divisors is an integer number (15554649).

Almost surely, 2^31109297 is an apocalyptic number.

It is an amenable number.

31109297 is a deficient number, since it is larger than the sum of its proper divisors (1).

31109297 is an equidigital number, since it uses as much as digits as its factorization.

31109297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 31109297 is about 5577.5708870439. The cubic root of 31109297 is about 314.5068187444.

The spelling of 31109297 in words is "thirty-one million, one hundred nine thousand, two hundred ninety-seven".