30337981 has 2 divisors, whose sum is σ = 30337982. Its totient is φ = 30337980.

The previous prime is 30337963. The next prime is 30337987. The reversal of 30337981 is 18973303.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26357956 + 3980025 = 5134^2 + 1995^2 .

It is a cyclic number.

It is not a de Polignac number, because 30337981 - 2²¹ = 28240829 is a prime.

It is a super-2 number, since 2×30337981² = 1840786182312722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30337987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15168990 + 15168991.

It is an arithmetic number, because the mean of its divisors is an integer number (15168991).

Almost surely, 2^30337981 is an apocalyptic number.

It is an amenable number.

30337981 is a deficient number, since it is larger than the sum of its proper divisors (1).

30337981 is an equidigital number, since it uses as much as digits as its factorization.

30337981 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 34.

The square root of 30337981 is about 5507.9924654996. The cubic root of 30337981 is about 311.8857686411.

The spelling of 30337981 in words is "thirty million, three hundred thirty-seven thousand, nine hundred eighty-one".