30359981 has 2 divisors, whose sum is σ = 30359982. Its totient is φ = 30359980.

The previous prime is 30359951. The next prime is 30359999. The reversal of 30359981 is 18995303.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22714756 + 7645225 = 4766^2 + 2765^2 .

It is an emirp because it is prime and its reverse (18995303) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30359981 is a prime.

It is a super-2 number, since 2×30359981² = 1843456892640722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30359921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15179990 + 15179991.

It is an arithmetic number, because the mean of its divisors is an integer number (15179991).

Almost surely, 2^30359981 is an apocalyptic number.

It is an amenable number.

30359981 is a deficient number, since it is larger than the sum of its proper divisors (1).

30359981 is an equidigital number, since it uses as much as digits as its factorization.

30359981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 30359981 is about 5509.9892014413. The cubic root of 30359981 is about 311.9611398292.

The spelling of 30359981 in words is "thirty million, three hundred fifty-nine thousand, nine hundred eighty-one".