30349381 has 2 divisors, whose sum is σ = 30349382. Its totient is φ = 30349380.

The previous prime is 30349367. The next prime is 30349409. The reversal of 30349381 is 18394303.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24661156 + 5688225 = 4966^2 + 2385^2 .

It is an emirp because it is prime and its reverse (18394303) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30349381 - 2⁹ = 30348869 is a prime.

It is a super-2 number, since 2×30349381² = 1842169854166322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30349181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15174690 + 15174691.

It is an arithmetic number, because the mean of its divisors is an integer number (15174691).

Almost surely, 2^30349381 is an apocalyptic number.

It is an amenable number.

30349381 is a deficient number, since it is larger than the sum of its proper divisors (1).

30349381 is an equidigital number, since it uses as much as digits as its factorization.

30349381 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 30349381 is about 5509.0272281048. The cubic root of 30349381 is about 311.9248291674.

The spelling of 30349381 in words is "thirty million, three hundred forty-nine thousand, three hundred eighty-one".