30981073 has 2 divisors, whose sum is σ = 30981074. Its totient is φ = 30981072.

The previous prime is 30981047. The next prime is 30981103. The reversal of 30981073 is 37018903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17497489 + 13483584 = 4183^2 + 3672^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30981073 is a prime.

It is not a weakly prime, because it can be changed into another prime (30981373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15490536 + 15490537.

It is an arithmetic number, because the mean of its divisors is an integer number (15490537).

Almost surely, 2^30981073 is an apocalyptic number.

It is an amenable number.

30981073 is a deficient number, since it is larger than the sum of its proper divisors (1).

30981073 is an equidigital number, since it uses as much as digits as its factorization.

30981073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 30981073 is about 5566.0644085386. The cubic root of 30981073 is about 314.0741200605.

Adding to 30981073 its reverse (37018903), we get a palindrome (67999976).

The spelling of 30981073 in words is "thirty million, nine hundred eighty-one thousand, seventy-three".