31130149 has 2 divisors, whose sum is σ = 31130150. Its totient is φ = 31130148.

The previous prime is 31130147. The next prime is 31130161. The reversal of 31130149 is 94103113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24930049 + 6200100 = 4993^2 + 2490^2 .

It is a cyclic number.

It is not a de Polignac number, because 31130149 - 2¹ = 31130147 is a prime.

Together with 31130147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31130147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15565074 + 15565075.

It is an arithmetic number, because the mean of its divisors is an integer number (15565075).

Almost surely, 2^31130149 is an apocalyptic number.

It is an amenable number.

31130149 is a deficient number, since it is larger than the sum of its proper divisors (1).

31130149 is an equidigital number, since it uses as much as digits as its factorization.

31130149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 31130149 is about 5579.4398464362. The cubic root of 31130149 is about 314.5770724638.

The spelling of 31130149 in words is "thirty-one million, one hundred thirty thousand, one hundred forty-nine".