30541781 has 2 divisors, whose sum is σ = 30541782. Its totient is φ = 30541780.

The previous prime is 30541757. The next prime is 30541783. The reversal of 30541781 is 18714503.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24661156 + 5880625 = 4966^2 + 2425^2 .

It is a cyclic number.

It is not a de Polignac number, because 30541781 - 2⁶ = 30541717 is a prime.

It is a super-2 number, since 2×30541781² = 1865600773303922, which contains 22 as substring.

Together with 30541783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30541783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15270890 + 15270891.

It is an arithmetic number, because the mean of its divisors is an integer number (15270891).

Almost surely, 2^30541781 is an apocalyptic number.

It is an amenable number.

30541781 is a deficient number, since it is larger than the sum of its proper divisors (1).

30541781 is an equidigital number, since it uses as much as digits as its factorization.

30541781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 30541781 is about 5526.4618880437. The cubic root of 30541781 is about 312.5825906502.

The spelling of 30541781 in words is "thirty million, five hundred forty-one thousand, seven hundred eighty-one".