30079981 has 2 divisors, whose sum is σ = 30079982. Its totient is φ = 30079980.

The previous prime is 30079979. The next prime is 30079999. The reversal of 30079981 is 18997003.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17892900 + 12187081 = 4230^2 + 3491^2 .

It is a cyclic number.

It is not a de Polignac number, because 30079981 - 2¹ = 30079979 is a prime.

It is a super-2 number, since 2×30079981² = 1809610513920722, which contains 22 as substring.

Together with 30079979, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 30079981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30079901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15039990 + 15039991.

It is an arithmetic number, because the mean of its divisors is an integer number (15039991).

Almost surely, 2^30079981 is an apocalyptic number.

It is an amenable number.

30079981 is a deficient number, since it is larger than the sum of its proper divisors (1).

30079981 is an equidigital number, since it uses as much as digits as its factorization.

30079981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 30079981 is about 5484.5219481738. The cubic root of 30079981 is about 310.9991384129. Note that the first 3 decimals are identical.

The spelling of 30079981 in words is "thirty million, seventy-nine thousand, nine hundred eighty-one".