30681605 has 4 divisors (see below), whose sum is σ = 36817932. Its totient is φ = 24545280.

The previous prime is 30681587. The next prime is 30681611. The reversal of 30681605 is 50618603.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21836929 + 8844676 = 4673^2 + 2974^2 .

It is not a de Polignac number, because 30681605 - 2¹⁰ = 30680581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3068156 + ... + 3068165.

It is an arithmetic number, because the mean of its divisors is an integer number (9204483).

Almost surely, 2^30681605 is an apocalyptic number.

It is an amenable number.

30681605 is a deficient number, since it is larger than the sum of its proper divisors (6136327).

30681605 is an equidigital number, since it uses as much as digits as its factorization.

30681605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6136326.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 30681605 is about 5539.0978507335. The cubic root of 30681605 is about 313.0588783003.

The spelling of 30681605 in words is "thirty million, six hundred eighty-one thousand, six hundred five".