30681281 has 2 divisors, whose sum is σ = 30681282. Its totient is φ = 30681280.

The previous prime is 30681269. The next prime is 30681293. The reversal of 30681281 is 18218603.

It is a balanced prime because it is at equal distance from previous prime (30681269) and next prime (30681293).

It can be written as a sum of positive squares in only one way, i.e., 30426256 + 255025 = 5516^2 + 505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30681281 is a prime.

It is a super-2 number, since 2×30681281² = 1882682007601922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30681221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15340640 + 15340641.

It is an arithmetic number, because the mean of its divisors is an integer number (15340641).

Almost surely, 2^30681281 is an apocalyptic number.

It is an amenable number.

30681281 is a deficient number, since it is larger than the sum of its proper divisors (1).

30681281 is an equidigital number, since it uses as much as digits as its factorization.

30681281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 30681281 is about 5539.0686040164. The cubic root of 30681281 is about 313.0577763215.

Adding to 30681281 its reverse (18218603), we get a palindrome (48899884).

The spelling of 30681281 in words is "thirty million, six hundred eighty-one thousand, two hundred eighty-one".