31608349 has 2 divisors, whose sum is σ = 31608350. Its totient is φ = 31608348.

The previous prime is 31608341. The next prime is 31608427. The reversal of 31608349 is 94380613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21483225 + 10125124 = 4635^2 + 3182^2 .

It is an emirp because it is prime and its reverse (94380613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31608349 - 2³ = 31608341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31608341) 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, 15804174 + 15804175.

It is an arithmetic number, because the mean of its divisors is an integer number (15804175).

Almost surely, 2^31608349 is an apocalyptic number.

It is an amenable number.

31608349 is a deficient number, since it is larger than the sum of its proper divisors (1).

31608349 is an equidigital number, since it uses as much as digits as its factorization.

31608349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 31608349 is about 5622.1302902014. The cubic root of 31608349 is about 316.1796666955.

The spelling of 31608349 in words is "thirty-one million, six hundred eight thousand, three hundred forty-nine".