30978193 has 2 divisors, whose sum is σ = 30978194. Its totient is φ = 30978192.

The previous prime is 30978149. The next prime is 30978203. The reversal of 30978193 is 39187903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19465744 + 11512449 = 4412^2 + 3393^2 .

It is a cyclic number.

It is not a de Polignac number, because 30978193 - 2¹³ = 30970001 is a prime.

It is not a weakly prime, because it can be changed into another prime (30978133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15489096 + 15489097.

It is an arithmetic number, because the mean of its divisors is an integer number (15489097).

Almost surely, 2^30978193 is an apocalyptic number.

It is an amenable number.

30978193 is a deficient number, since it is larger than the sum of its proper divisors (1).

30978193 is an equidigital number, since it uses as much as digits as its factorization.

30978193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 30978193 is about 5565.8056919012. The cubic root of 30978193 is about 314.0643876507.

The spelling of 30978193 in words is "thirty million, nine hundred seventy-eight thousand, one hundred ninety-three".