30831349 has 2 divisors, whose sum is σ = 30831350. Its totient is φ = 30831348.

The previous prime is 30831347. The next prime is 30831377. The reversal of 30831349 is 94313803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21921124 + 8910225 = 4682^2 + 2985^2 .

It is an emirp because it is prime and its reverse (94313803) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30831349 - 2¹ = 30831347 is a prime.

Together with 30831347, it forms a pair of twin primes.

It is equal to p_1906249 and since 30831349 and 1906249 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30831349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30831347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15415674 + 15415675.

It is an arithmetic number, because the mean of its divisors is an integer number (15415675).

Almost surely, 2^30831349 is an apocalyptic number.

It is an amenable number.

30831349 is a deficient number, since it is larger than the sum of its proper divisors (1).

30831349 is an equidigital number, since it uses as much as digits as its factorization.

30831349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 30831349 is about 5552.5984007490. The cubic root of 30831349 is about 313.5673548477.

The spelling of 30831349 in words is "thirty million, eight hundred thirty-one thousand, three hundred forty-nine".