30705149 has 2 divisors, whose sum is σ = 30705150. Its totient is φ = 30705148.

The previous prime is 30705137. The next prime is 30705163. The reversal of 30705149 is 94150703.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27899524 + 2805625 = 5282^2 + 1675^2 .

It is an emirp because it is prime and its reverse (94150703) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30705149 - 2⁴ = 30705133 is a prime.

It is a super-2 number, since 2×30705149² = 1885612350224402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30705119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15352574 + 15352575.

It is an arithmetic number, because the mean of its divisors is an integer number (15352575).

Almost surely, 2^30705149 is an apocalyptic number.

It is an amenable number.

30705149 is a deficient number, since it is larger than the sum of its proper divisors (1).

30705149 is an equidigital number, since it uses as much as digits as its factorization.

30705149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 30705149 is about 5541.2226990079. Note that the first 3 decimals coincide. The cubic root of 30705149 is about 313.1389346696.

The spelling of 30705149 in words is "thirty million, seven hundred five thousand, one hundred forty-nine".