30381493 has 2 divisors, whose sum is σ = 30381494. Its totient is φ = 30381492.

The previous prime is 30381487. The next prime is 30381503. The reversal of 30381493 is 39418303.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15311569 + 15069924 = 3913^2 + 3882^2 .

It is an emirp because it is prime and its reverse (39418303) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30381493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30381443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15190746 + 15190747.

It is an arithmetic number, because the mean of its divisors is an integer number (15190747).

Almost surely, 2^30381493 is an apocalyptic number.

It is an amenable number.

30381493 is a deficient number, since it is larger than the sum of its proper divisors (1).

30381493 is an equidigital number, since it uses as much as digits as its factorization.

30381493 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 30381493 is about 5511.9409467083. The cubic root of 30381493 is about 312.0348039467.

Adding to 30381493 its reverse (39418303), we get a palindrome (69799796).

It can be divided in two parts, 303 and 81493, that added together give a square (81796 = 286²).

The spelling of 30381493 in words is "thirty million, three hundred eighty-one thousand, four hundred ninety-three".