30793021381 has 2 divisors, whose sum is σ = 30793021382. Its totient is φ = 30793021380.

The previous prime is 30793021373. The next prime is 30793021387. The reversal of 30793021381 is 18312039703.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29392016481 + 1401004900 = 171441^2 + 37430^2 .

It is a cyclic number.

It is not a de Polignac number, because 30793021381 - 2³ = 30793021373 is a prime.

It is a super-2 number, since 2×30793021381² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30793021381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30793021387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15396510690 + 15396510691.

It is an arithmetic number, because the mean of its divisors is an integer number (15396510691).

Almost surely, 2^30793021381 is an apocalyptic number.

It is an amenable number.

30793021381 is a deficient number, since it is larger than the sum of its proper divisors (1).

30793021381 is an equidigital number, since it uses as much as digits as its factorization.

30793021381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The spelling of 30793021381 in words is "thirty billion, seven hundred ninety-three million, twenty-one thousand, three hundred eighty-one".