30518993 has 2 divisors, whose sum is σ = 30518994. Its totient is φ = 30518992.

The previous prime is 30518981. The next prime is 30519001. The reversal of 30518993 is 39981503.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18464209 + 12054784 = 4297^2 + 3472^2 .

It is an emirp because it is prime and its reverse (39981503) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30518993 - 2⁴ = 30518977 is a prime.

It is not a weakly prime, because it can be changed into another prime (30518903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15259496 + 15259497.

It is an arithmetic number, because the mean of its divisors is an integer number (15259497).

Almost surely, 2^30518993 is an apocalyptic number.

It is an amenable number.

30518993 is a deficient number, since it is larger than the sum of its proper divisors (1).

30518993 is an equidigital number, since it uses as much as digits as its factorization.

30518993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 30518993 is about 5524.3997864021. The cubic root of 30518993 is about 312.5048293654.

The spelling of 30518993 in words is "thirty million, five hundred eighteen thousand, nine hundred ninety-three".