31305349 has 2 divisors, whose sum is σ = 31305350. Its totient is φ = 31305348.

The previous prime is 31305301. The next prime is 31305361. The reversal of 31305349 is 94350313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30636225 + 669124 = 5535^2 + 818^2 .

It is an emirp because it is prime and its reverse (94350313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31305349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31305389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15652674 + 15652675.

It is an arithmetic number, because the mean of its divisors is an integer number (15652675).

Almost surely, 2^31305349 is an apocalyptic number.

It is an amenable number.

31305349 is a deficient number, since it is larger than the sum of its proper divisors (1).

31305349 is an equidigital number, since it uses as much as digits as its factorization.

31305349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 31305349 is about 5595.1183186775. The cubic root of 31305349 is about 315.1661137794.

The spelling of 31305349 in words is "thirty-one million, three hundred five thousand, three hundred forty-nine".