30320981 has 2 divisors, whose sum is σ = 30320982. Its totient is φ = 30320980.

The previous prime is 30320963. The next prime is 30320987. The reversal of 30320981 is 18902303.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22648081 + 7672900 = 4759^2 + 2770^2 .

It is a cyclic number.

It is not a de Polignac number, because 30320981 - 2¹⁴ = 30304597 is a prime.

It is a super-2 number, since 2×30320981² = 1838723777604722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 30320981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30320987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15160490 + 15160491.

It is an arithmetic number, because the mean of its divisors is an integer number (15160491).

Almost surely, 2^30320981 is an apocalyptic number.

It is an amenable number.

30320981 is a deficient number, since it is larger than the sum of its proper divisors (1).

30320981 is an equidigital number, since it uses as much as digits as its factorization.

30320981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 30320981 is about 5506.4490372653. The cubic root of 30320981 is about 311.8275023081.

The spelling of 30320981 in words is "thirty million, three hundred twenty thousand, nine hundred eighty-one".