30681313 has 4 divisors (see below), whose sum is σ = 33041428. Its totient is φ = 28321200.

The previous prime is 30681307. The next prime is 30681319. The reversal of 30681313 is 31318603.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (30681307) and next prime (30681319).

It can be written as a sum of positive squares in 2 ways, for example, as 9778129 + 20903184 = 3127^2 + 4572^2 .

It is a cyclic number.

It is not a de Polignac number, because 30681313 - 2⁵ = 30681281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30681319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1180038 + ... + 1180063.

It is an arithmetic number, because the mean of its divisors is an integer number (8260357).

Almost surely, 2^30681313 is an apocalyptic number.

It is an amenable number.

30681313 is a deficient number, since it is larger than the sum of its proper divisors (2360115).

30681313 is a wasteful number, since it uses less digits than its factorization.

30681313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360114.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 30681313 is about 5539.0714925879. The cubic root of 30681313 is about 313.0578851593.

Adding to 30681313 its reverse (31318603), we get a palindrome (61999916).

It can be divided in two parts, 30681 and 313, that multiplied together give a triangular number (9603153 = T₄₃₈₂).

The spelling of 30681313 in words is "thirty million, six hundred eighty-one thousand, three hundred thirteen".